{"article_info":{"article_id":90978,"cat_id":643,"cat_title":"SGK Toán 6 - Kết nối tri thức","publish_time":1626057000,"cat_id2":643,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0723/resize_ly-thuyet-cach-ghi-so-tu-nhien-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Lý thuyết Cách ghi số tự nhiên Toán 6 Kết nối tri thức với cuộc sống","label":"Cách ghi số tự nhiên","alias":"ly-thuyet-cach-ghi-so-tu-nhien-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"Lý thuyết Cách ghi số tự nhiên Toán 6 Kết nối tri thức với cuộc sống ngắn gọn, đầy đủ, dễ hiểu","content":"<p><span style=\"color: #000080;\"><strong>Biểu diễn 1 số dưới dạng tổng các chữ số của nó</strong></span></p>\r\n<div class=\"video-container\"><iframe src=\"https://www.youtube.com/embed/SrDcCOyhRXM\" frameborder=\"0\" allowfullscreen=\"1\" width=\"560\" height=\"349\"></iframe></div>\r\n<h4 class=\"title-head\"><span style=\"color: #000080;\"><strong>I. Hệ thập phân</strong></span></h4>\r\n<p class=\"MsoNormal\"><span style=\"color: #0000ff;\"><strong><span style=\"font-size: 12pt; line-height: 115%;\">1. Cách ghi số tự nhiên trong hệ thập phân</span></strong></span></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Để <strong>ghi số tự nhiên</strong> trong <strong>hệ thập phân</strong>, người ta dùng <strong>mười chữ số</strong> là <span class=\"MTConvertedEquation\">\\(0;1;2;3;4;5;6;7;8;9.\\)</span> Người ta lấy các chữ số trong 10 chữ số này rồi viết liền nhau thành một dãy, vị trí của các chữ số đó trong dãy gọi là hàng.</span></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Trong hệ thập phân, cứ <strong>10 đơn vị</strong> của một hàng thì làm thành <strong>1 đơn vị</strong> của <strong>hàng liền trước</strong> đó. Ví dụ 10 chục thì bằng 1 trăm; mười trăm thì bằng 1 nghìn;...</span></p>\r\n<p class=\"MsoNormal\"><strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Chú ý:</span></strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\"> Khi viết các số tự nhiên, ta quy ước:</span></p>\r\n<p class=\"MsoNormal\"><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">1. Với các số tự nhiên khác 0, chữ số đầu tiên bên trái khác 0.</span></em></p>\r\n<p class=\"MsoNormal\"><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">2. Đối với các số có 4 chữ số khác 0 trở lên, ta viết tách riêng từng lớp. Mỗi lớp là một nhóm 3 chữ só từ phải sang trái.</span></em></p>\r\n<p class=\"MsoNormal\"><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">3. Với những số tự nhiên có nhiều chữ số, mỗi chữ số ở các vị trí (hàng) khác nhau thì có giá trị khác nhau</span></em></p>\r\n<p class=\"MsoNormal\"><strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Ví dụ:</span></strong></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Số 120 250 160 555</span></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">- <strong>Đọc</strong>: Một trăm hai mươi tỉ, hai trăm năm mươi triệu một trăm sáu mươi nghìn năm trăm năm mươi lăm.</span></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">- <strong>Các lớp</strong>: lớp tỉ, triệu, nghìn, đơn vị được ghi lại như sau:</span></p>\r\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\r\n<tbody>\r\n<tr>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">Lớp</p>\r\n</td>\r\n<td colspan=\"3\" valign=\"top\" width=\"169\">\r\n<p align=\"center\">Tỉ</p>\r\n</td>\r\n<td colspan=\"3\" valign=\"top\" width=\"169\">\r\n<p align=\"center\">Triệu</p>\r\n</td>\r\n<td colspan=\"3\" valign=\"top\" width=\"170\">\r\n<p align=\"center\">Nghìn</p>\r\n</td>\r\n<td colspan=\"3\" valign=\"top\" width=\"170\">\r\n<p align=\"center\">Đơn vị</p>\r\n</td>\r\n</tr>\r\n<tr>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">Hàng</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\"><strong>Trăm tỉ</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\"><strong>Chục tỉ</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\"><strong>Tỉ</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\"><strong>Trăm triệu</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\"><strong>Chục triệu</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\"><strong>Triệu</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\"><strong>Trăm nghìn</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\"><strong>Chục nghìn</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\"><strong>Nghìn</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\"><strong>Trăm</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\"><strong>Chục</strong></p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\"><strong>Đơn vị</strong></p>\r\n</td>\r\n</tr>\r\n<tr>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">Chữ số</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">1</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">2</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">0</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">2</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">5</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">0</p>\r\n</td>\r\n<td valign=\"top\" width=\"56\">\r\n<p align=\"center\">1</p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\">6</p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\">0</p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\">5</p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\">5</p>\r\n</td>\r\n<td valign=\"top\" width=\"57\">\r\n<p align=\"center\">5</p>\r\n</td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n<p><span style=\"font-size: 12pt;\">- Cùng là số 2 nhưng số 2 ở hàng chục tỉ có giá trị khác với số 2 ở hàng trăm triệu.</span></p>\r\n<p class=\"MsoNormal\"><span style=\"color: #0000ff;\"><strong><span style=\"font-size: 12pt; line-height: 115%;\">2. Cấu tạo thập phân của một số</span></strong></span></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">+ Kí hiệu <span class=\"MTConvertedEquation\">\\(\\overline {ab} \\)</span> chỉ số tự nhiên có hai chữ số, chữ số hàng chục là <span class=\"MTConvertedEquation\">\\(a\\left( {a \\ne 0} \\right)\\)</span>, chứ số hàng đơn vị là <span class=\"MTConvertedEquation\">\\(b\\)</span>. Ta có:</span></p>\r\n<p class=\"MsoNormal\"><span class=\"MTConvertedEquation\"><span style=\"font-size: 12.0pt; line-height: 115%;\">\\(\\overline {ab}  = \\left( {a \\times 10} \\right) + b\\) </span></span><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">với <span class=\"MTConvertedEquation\">\\(a \\ne 0.\\)</span> </span></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">+ Kí hiệu <span class=\"MTConvertedEquation\">\\(\\overline {abc} \\)</span> chỉ số tự nhiên có 3 chữ số, chữ số hàng trăm là <span class=\"MTConvertedEquation\">\\(a\\left( {a \\ne 0} \\right)\\)</span>,  chữ số hàng chục là <span class=\"MTConvertedEquation\">\\(b\\)</span>, chữ số hàng đơn vị là <span class=\"MTConvertedEquation\">\\(c\\)</span>. Ta có:</span></p>\r\n<p class=\"MsoNormal\"><span class=\"MTConvertedEquation\"><span style=\"font-size: 12.0pt; line-height: 115%;\">\\(\\overline {abc}  = a.100 + b.10 + c\\)</span></span><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\"> với <span class=\"MTConvertedEquation\">\\(a \\ne 0.\\)</span> </span></p>\r\n<p class=\"MsoNormal\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">+ Với các số tự nhiên cụ thể thì không có dấu gạch ngang trên đầu.</span></p>\r\n<p class=\"MsoNormal\"><strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Ví dụ:</span></strong></p>\r\n<p class=\"MsoNormal\"><span class=\"MTConvertedEquation\"><span style=\"font-size: 12.0pt; line-height: 115%;\">\\(\\begin{array}{l}\\overline {2b}  = 2.10 + b\\\\\\overline {a5b}  = a.100 + 5.10 + b\\left( {a \\ne 0} \\right)\\end{array}\\)</span></span></p>\r\n<p class=\"MsoNormal\"><span class=\"MTConvertedEquation\"><span style=\"font-size: 12.0pt; line-height: 115%;\">\\(\\overline {a03bcd}  = a.100000 + 0.10000\\)\\( + 3.1000 + b.100 + c.10 + d\\)\\(\\left( {a \\ne 0} \\right)\\)</span></span></p>\r\n<h4 class=\"title-head\"><span style=\"color: #000080;\"><strong>II. Hệ La Mã</strong></span></h4>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Cách viết số La Mã: </span></strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Ta chỉ viết các số La Mã không quá 30.</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">+ Các thành phần để ghi số La Mã:</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">- Các kí tự  I, V, X : Các chữ số La Mã.</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">- Các cụm chữ số IV, IX</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">- Giá trị của các thành phần này không thay đổi dù ở vị trí nào.</span></div>\r\n<div style=\"text-align: left;\">\r\n<table class=\"MsoTableGrid\" style=\"width: 100%; border-collapse: collapse; border: none;\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\r\n<tbody>\r\n<tr style=\"mso-yfti-irow: 0; mso-yfti-firstrow: yes; height: 7.05pt;\">\r\n<td style=\"width: 200px; border: 1pt solid windowtext; padding: 0cm 5.4pt; height: 7.05pt;\" width=\"183\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">Thành phần</span></strong></p>\r\n</td>\r\n<td style=\"width: 45px; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 7.05pt;\" width=\"30\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">I</span></strong></p>\r\n</td>\r\n<td style=\"width: 53px; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 7.05pt;\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">V</span></strong></p>\r\n</td>\r\n<td style=\"width: 54px; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 7.05pt;\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">X</span></strong></p>\r\n</td>\r\n<td style=\"width: 54px; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 7.05pt;\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">IV</span></strong></p>\r\n</td>\r\n<td style=\"width: 61px; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 7.05pt;\" width=\"44\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">IX</span></strong></p>\r\n</td>\r\n</tr>\r\n<tr style=\"mso-yfti-irow: 1; mso-yfti-lastrow: yes; height: 20.7pt;\">\r\n<td style=\"width: 200px; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-left: 1pt solid windowtext; border-image: initial; border-top: none; padding: 0cm 5.4pt; height: 20.7pt;\" width=\"183\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">Giá trị (viết trong hệ thập phân)</span></strong></p>\r\n</td>\r\n<td style=\"width: 45px; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 20.7pt;\" width=\"30\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">1</span></strong></p>\r\n</td>\r\n<td style=\"width: 53px; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 20.7pt;\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">5</span></strong></p>\r\n</td>\r\n<td style=\"width: 54px; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 20.7pt;\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">10</span></strong></p>\r\n</td>\r\n<td style=\"width: 54px; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 20.7pt;\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">4</span></strong></p>\r\n</td>\r\n<td style=\"width: 61px; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 20.7pt;\" width=\"44\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; text-align: center; line-height: normal;\" align=\"center\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">9</span></strong></p>\r\n</td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n</div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"> </div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Các số La Mã biểu diễn các số từ 1 đến 10</span></em></div>\r\n<div style=\"text-align: left;\">\r\n<table class=\"MsoTableGrid\" style=\"width: 100%; border-collapse: collapse; border: none; height: 26px;\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\r\n<tbody>\r\n<tr style=\"mso-yfti-irow: 0; mso-yfti-firstrow: yes; height: 13.15pt;\">\r\n<td style=\"width: 26.25pt; border: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"35\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">I</span></strong></p>\r\n</td>\r\n<td style=\"width: 26.95pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">II</span></strong></p>\r\n</td>\r\n<td style=\"width: 28pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: 0.0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">III</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.85pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">IV</span></strong></p>\r\n</td>\r\n<td style=\"width: 26.8pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">V</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.85pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">VI</span></strong></p>\r\n</td>\r\n<td style=\"width: 28.85pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"38\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">VII</span></strong></p>\r\n</td>\r\n<td style=\"width: 29.85pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"40\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">VIII</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.85pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">IX</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.55pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">X</span></strong></p>\r\n</td>\r\n</tr>\r\n<tr style=\"mso-yfti-irow: 1; mso-yfti-lastrow: yes; height: 13.15pt;\">\r\n<td style=\"width: 26.25pt; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-left: 1pt solid windowtext; border-image: initial; border-top: none; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"35\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">1</span></p>\r\n</td>\r\n<td style=\"width: 26.95pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">2</span></p>\r\n</td>\r\n<td style=\"width: 28pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">3</span></p>\r\n</td>\r\n<td style=\"width: 27.85pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">4</span></p>\r\n</td>\r\n<td style=\"width: 26.8pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">5</span></p>\r\n</td>\r\n<td style=\"width: 27.85pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">6</span></p>\r\n</td>\r\n<td style=\"width: 28.85pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"38\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">7</span></p>\r\n</td>\r\n<td style=\"width: 29.85pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"40\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">8</span></p>\r\n</td>\r\n<td style=\"width: 27.85pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">9</span></p>\r\n</td>\r\n<td style=\"width: 27.55pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 13px; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">10</span></p>\r\n</td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n</div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"> </div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Các số La Mã biểu diễn các số từ 11 đến 20: Thêm X vào bên trái mỗi số từ I đến X</span></em></div>\r\n<div style=\"text-align: left;\">\r\n<table class=\"MsoTableGrid\" style=\"width: 100%; border-collapse: collapse; border: none;\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\r\n<tbody>\r\n<tr style=\"mso-yfti-irow: 0; mso-yfti-firstrow: yes; height: 15.3pt;\">\r\n<td style=\"width: 20.15pt; border: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"27\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XI</span></strong></p>\r\n</td>\r\n<td style=\"width: 23.95pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"32\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XII</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.8pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XIII</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.25pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XIV</span></strong></p>\r\n</td>\r\n<td style=\"width: 23.35pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"31\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XV</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.25pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XVI</span></strong></p>\r\n</td>\r\n<td style=\"width: 31.15pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XVII</span></strong></p>\r\n</td>\r\n<td style=\"width: 35pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"47\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XVIII</span></strong></p>\r\n</td>\r\n<td style=\"width: 27.25pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XIX</span></strong></p>\r\n</td>\r\n<td style=\"width: 23.35pt; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"31\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XX</span></strong></p>\r\n</td>\r\n</tr>\r\n<tr style=\"mso-yfti-irow: 1; mso-yfti-lastrow: yes; height: 15.3pt;\">\r\n<td style=\"width: 20.15pt; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-left: 1pt solid windowtext; border-image: initial; border-top: none; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"27\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">11</span></p>\r\n</td>\r\n<td style=\"width: 23.95pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"32\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">12</span></p>\r\n</td>\r\n<td style=\"width: 27.8pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">13</span></p>\r\n</td>\r\n<td style=\"width: 27.25pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">14</span></p>\r\n</td>\r\n<td style=\"width: 23.35pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"31\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">15</span></p>\r\n</td>\r\n<td style=\"width: 27.25pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">16</span></p>\r\n</td>\r\n<td style=\"width: 31.15pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">17</span></p>\r\n</td>\r\n<td style=\"width: 35pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"47\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">18</span></p>\r\n</td>\r\n<td style=\"width: 27.25pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"36\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">19</span></p>\r\n</td>\r\n<td style=\"width: 23.35pt; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 15.3pt; text-align: center;\" valign=\"top\" width=\"31\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">20</span></p>\r\n</td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n</div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\"> </span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Các số La Mã biểu diễn các số từ 21 đến 30: Thêm XX vào bên trái mỗi số từ I đến X</span></em></div>\r\n<div style=\"text-align: left;\">\r\n<table class=\"MsoTableGrid\" style=\"width: 100%; border-collapse: collapse; border: none;\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\r\n<tbody>\r\n<tr style=\"mso-yfti-irow: 0; mso-yfti-firstrow: yes; height: 18.8pt;\">\r\n<td style=\"width: 8.11456%; border: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"33\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXI</span></strong></p>\r\n</td>\r\n<td style=\"width: 9.54654%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"38\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXII</span></strong></p>\r\n</td>\r\n<td style=\"width: 10.8592%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXIII</span></strong></p>\r\n</td>\r\n<td style=\"width: 9.90453%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXIV</span></strong></p>\r\n</td>\r\n<td style=\"width: 8.47255%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXV</span></strong></p>\r\n</td>\r\n<td style=\"width: 10.0239%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXVI</span></strong></p>\r\n</td>\r\n<td style=\"width: 11.3365%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"46\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXVII</span></strong></p>\r\n</td>\r\n<td style=\"width: 12.8878%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"51\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXVIII</span></strong></p>\r\n</td>\r\n<td style=\"width: 10.0239%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXIX</span></strong></p>\r\n</td>\r\n<td style=\"width: 8.83055%; border-top: 1pt solid windowtext; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-image: initial; border-left: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><strong><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">XXX</span></strong></p>\r\n</td>\r\n</tr>\r\n<tr style=\"mso-yfti-irow: 1; mso-yfti-lastrow: yes; height: 18.8pt;\">\r\n<td style=\"width: 8.11456%; border-right: 1pt solid windowtext; border-bottom: 1pt solid windowtext; border-left: 1pt solid windowtext; border-image: initial; border-top: none; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"33\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">21</span></p>\r\n</td>\r\n<td style=\"width: 9.54654%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"38\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">22</span></p>\r\n</td>\r\n<td style=\"width: 10.8592%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">23</span></p>\r\n</td>\r\n<td style=\"width: 9.90453%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">24</span></p>\r\n</td>\r\n<td style=\"width: 8.47255%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">25</span></p>\r\n</td>\r\n<td style=\"width: 10.0239%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">26</span></p>\r\n</td>\r\n<td style=\"width: 11.3365%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"46\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">27</span></p>\r\n</td>\r\n<td style=\"width: 12.8878%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"51\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">28</span></p>\r\n</td>\r\n<td style=\"width: 10.0239%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"42\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">29</span></p>\r\n</td>\r\n<td style=\"width: 8.83055%; border-top: none; border-left: none; border-bottom: 1pt solid windowtext; border-right: 1pt solid windowtext; padding: 0cm 5.4pt; height: 18.8pt; text-align: center;\" valign=\"top\" width=\"37\">\r\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt; line-height: normal;\"><span style=\"font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: VI; mso-fareast-language: EN-US;\">30</span></p>\r\n</td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n</div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"> </div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Chú ý: </span></strong></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">- Mỗi số La Mã biểu diễn một số tự nhiên bằng tổng giá trị của các thành phần tạo nên số đó.</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">- Không có số La Mã nào biểu diễn số 0.</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Ví dụ: </span></strong></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><strong><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Số XIII</span></em></strong><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\"> có 4 thành phần là X, I, I, I tương ứng với các giá trị 10,1,1,1. Do đó biểu diễn số 10+1+1+1=13.</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><strong><em><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Viết số 17 thành số La Mã: </span></em></strong></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Số 7 được viết là VII </span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\">Số 17 = 7+10, tức là số 7 thêm 10 đơn vị nên ta thêm chữ X trước VII được: XVII</span></div>\r\n<div class=\"MsoNormal\" style=\"text-align: left;\"><span style=\"font-size: 12.0pt; line-height: 115%; mso-ansi-language: VI;\"><img src=\"https://img.loigiaihay.com/picture/2021/0901/so-do-tu-duy-bai-2.jpg\" class=\"zoom_image\" style=\"width: 100%; max-width: 700px;\" /></span></div>","common_article":"","display_type":0,"vungoi_exam_id":"","article_type":1,"cmt_count":2,"zip_status":1,"last_modified_time":1673948702,"last_zip_time":1673948702,"zip_link":"https://offline.loigiaihay.com/articles/643/90978/90978_1673948702.zip","picture":"https://img.loigiaihay.com/picture/article/2021/0723/ly-thuyet-cach-ghi-so-tu-nhien-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","youtube_id":"","url_upload_pdf":"https://img.loigiaihay.com/picture/share_img/2021/0811/ly-thuyet-cach-ghi-so-tu-nhien-toan-6-ket-noi-tri-thuc-voi-cuoc-song.pdf","video_start_time":"0","quizlet_id":"0","ref_article_id":0,"readmore_display_type":0,"wiki":0,"comment_url":"https://loigiaihay.com/comment/ly-thuyet-cach-ghi-so-tu-nhien-toan-6-ket-noi-tri-thuc-voi-cuoc-song-c643a90978.html","origin_url":"https://loigiaihay.com/ly-thuyet-cach-ghi-so-tu-nhien-toan-6-ket-noi-tri-thuc-voi-cuoc-song-c643a90978.html","relate_link":[]},"callouts":[],"relate_articles":[],"others_in_cat":[{"article_id":92249,"cat_id":643,"publish_time":1626746100,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_tra-loi-cau-hoi-trang-9-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Trả lời Câu hỏi trang 9 SGK Toán 6 Kết nối tri thức với cuộc sống","alias":"tra-loi-cau-hoi-trang-9-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"Từ ba chữ số 0, 1 và 2, viết các số tự nhiên có ba chữ số, mỗi chữ số chỉ viết một lần.","display_type":1,"article_type":1},{"article_id":92250,"cat_id":643,"publish_time":1626746880,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_tra-loi-hoat-dong-1-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Trả lời Hoạt động 1 trang 10 SGK Toán 6 Kết nối tri thức với cuộc sống ","alias":"tra-loi-hoat-dong-1-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"Trong số 32 019, ta thấy:\r\n\"Chữ số 2 nằm ở hàng nghìn và có giá trị bằng 2 x 1 000 = 2 000\".\r\nHãy phát biểu theo mẫu câu đó đối với các chữ số còn lại.","display_type":1,"article_type":1},{"article_id":92251,"cat_id":643,"publish_time":1626746880,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_tra-loi-hoat-dong-2-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Trả lời Hoạt động 2 trang 10 SGK Toán 6 Kết nối tri thức với cuộc sống ","alias":"tra-loi-hoat-dong-2-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"Viết số 32 019 thành tổng giá trị các chữ số của nó. ","display_type":1,"article_type":1},{"article_id":92252,"cat_id":643,"publish_time":1626746880,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_tra-loi-luyen-tap-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Trả lời Luyện tập trang 10 SGK Toán 6 Kết nối tri thức với cuộc sống","alias":"tra-loi-luyen-tap-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"Viết số 34 604 thành tổng giá trị các chữ số của nó ","display_type":1,"article_type":1},{"article_id":92253,"cat_id":643,"publish_time":1626746880,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_tra-loi-van-dung-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Trả lời Vận dụng trang 10 SGK Toán 6 Kết nối tri thức với cuộc sống ","alias":"tra-loi-van-dung-trang-10-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"Bác Hoa đi chợ, Bác chi mang ba loại tiền: loại (có mệnh giá) 1 nghìn (1 0000 đồng, loại 10 nghìn (10 000 đồng và loại 100 nghìn (100 000 đồng. Tổng số tiền bác phải trả là 492 nghìn đồng. Nếu mỗi loại tiền, bác mang theo không quá 9 tờ thì bác sẽ phải trả bao nhiêu tờ tiền mỗi loại, mà người bán không phải trả lại tiền thừa?","display_type":1,"article_type":1},{"article_id":92254,"cat_id":643,"publish_time":1626746880,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_tra-loi-cau-hoi-trang-11-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Trả lời Câu hỏi trang 11 SGK Toán 6 Kết nối tri thức với cuộc sống ","alias":"tra-loi-cau-hoi-trang-11-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"a) Viết các số 14 và 27 bằng số La Mã.\r\nb) Đọc các số La Mã XVI, XXII.","display_type":1,"article_type":1},{"article_id":92255,"cat_id":643,"publish_time":1626746880,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_tra-loi-thu-thach-nho-trang-11-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-0.jpg","title":"Trả lời Thử thách nhỏ trang 11 SGK Toán 6 Kết nối tri thức với cuộc sống ","alias":"tra-loi-thu-thach-nho-trang-11-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song","introtext":"Sử dụng đúng 7 que tính, em xếp được những số La Mã nào?","display_type":1,"article_type":1},{"article_id":89322,"cat_id":643,"publish_time":1623055320,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_giai-bai-16-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1-0.jpg","title":"Giải Bài 1.6 trang 12 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1","alias":"giai-bai-16-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1","introtext":"Cho các số: 27 501; 106 712; 7 110 385; 2 915 404 267 (viết trong hệ thập phân)\r\na) Đọc mỗi số đã cho\r\nb) Chữ số 7 trong mỗi số đã cho có giá trị bằng bao nhiêu","display_type":1,"article_type":1},{"article_id":89323,"cat_id":643,"publish_time":1623055440,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_giai-bai-17-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1-0.jpg","title":"Giải Bài 1.7 trang 12 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1","alias":"giai-bai-17-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1","introtext":"Chữ số 4 đứng ở hàng nào trong một số tự nhiên nếu nó có giá trị bằng a) 400 b) 40 c) 4","display_type":1,"article_type":1},{"article_id":89324,"cat_id":643,"publish_time":1623055440,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_giai-bai-18-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1-0.jpg","title":"Giải Bài 1.8 trang 12 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1","alias":"giai-bai-18-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1","introtext":"Đọc các số La Mã XIV; XVI; XXIII.","display_type":1,"article_type":1},{"article_id":89325,"cat_id":643,"publish_time":1623055500,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_giai-bai-19-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1-0.jpg","title":"Giải Bài 1.9 trang 12 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1","alias":"giai-bai-19-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1","introtext":"Viết các số sau bằng số La Mã: 18, 25","display_type":1,"article_type":1},{"article_id":89326,"cat_id":643,"publish_time":1623055560,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_giai-bai-110-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1-0.jpg","title":"Giải Bài 1.10 trang 12 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1","alias":"giai-bai-110-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1","introtext":"Một số tự nhiên được viết bởi ba chữ số 0 và ba chữ số 9 nằm xen kẽ nhau. Đó là số nào?","display_type":1,"article_type":1},{"article_id":89327,"cat_id":643,"publish_time":1623055620,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_giai-bai-111-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1-0.jpg","title":"Giải Bài 1.11 trang 12 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1","alias":"giai-bai-111-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1","introtext":"Dùng các chữ số 0, 3 và 5, viết một số tự nhiên có ba chữ số khác nhau mà chữ số 5 có giá trị là 50","display_type":1,"article_type":1},{"article_id":89328,"cat_id":643,"publish_time":1623055620,"is_link":0,"thumbnail":"https://img.loigiaihay.com/picture/article/2021/0726/resize_giai-bai-112-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1-0.jpg","title":"Giải Bài 1.12 trang 12 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1","alias":"giai-bai-112-trang-12-sgk-toan-6-ket-noi-tri-thuc-voi-cuoc-song-tap-1","introtext":"Trong một cửa hàng bánh kẹo, người ta đóng gói kẹo thành các loại: mỗi gói có 10 cái kẹo, mỗi hộp có 10 gói, mỗi thùng có 10 hộp. Một người mua 9 thùng, 9 hộp và 9 gói kẹo. Hỏi người đó đã mua tất cả bao nhiêu cái kẹo","display_type":1,"article_type":1},{"article_id":105005,"cat_id":643,"publish_time":1641876960,"is_link":0,"thumbnail":"","title":"Các dạng toán về ghi số tự nhiên","alias":"cac-dang-toan-ve-ghi-so-tu-nhien","introtext":"Các dạng toán về ghi số tự nhiên","display_type":0,"article_type":1}],"event_info":{"title":"Bài 2. Cách ghi số tự nhiên - Toán 6 Kết nối tri thức với cuộc sống","cat_id":643,"alias":"bai-2-cach-ghi-so-tu-nhien","introtext":"","type":"event","item_id":22311,"item_type":2},"banner":[],"top_banner":"","content_expanded":[],"child_events":[{"id":"22311","title":"Bài 2. Cách ghi số tự nhiên - Toán 6 Kết nối tri thức với cuộc sống","short_title":"Bài 2. 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