(g) explain the use of hexadecimal numbers to represent binary numbers Characters Whole class; History of PPT, SEN: Help sheets How do systems agree on ASCII code worksheets, and reinforcing key codes being used by the 2 (h) explain the use of WWW terms computer? binary codes to Examples given to class represent characters of ASCII code table G&T: How do we What were the origins of enter extra bytes? Did it always = 8 bits? (i) explain the term Understanding the characters when character set different codes used What are the differences using a computer if within the table between using an ASCII there are not (j) describe with character set and a Unicode enough keys or examples (for example Exercises using the character set? combinations? ASCII and Unicode) ASCII table (e.g. spell the relationship name in binary, create a G&T: What is between the number of letter using hex/ decimal/ meant by the term bits per character in a binary) ‘word length’? character set and the (research and Research ASCII and number of characters explain) Unicode relationships? – which can be Differences? represented Explanations Images Research; history and PPT, SEN: Help sheets What is metadata? information on how worksheets, and reinforcing key 2 (k) explain the How can an image be images are formed WWW, hex terms representation of an represented by binary image editor, image as a series of Whole Class; Discuss G&T: Create some numbers? image files pixels represented in findings and links images, identify What are the main factors binary between pixels and the properties and affecting the size of an image binary convert them to (l) explain the need for file? binary numbers metadata to be Discuss properties, sizes included in the file and colour depth of such as height, width images and colour depth Explanation of pixels and (m) discuss the effect binary, resolutions, of colour depth and
(g) explain the use of hexadecimal numbers to represent binary numbers 2 Characters (h) explain the use of binary codes to represent characters (i) explain the term character set (j) describe with examples (for example ASCII and Unicode) the relationship between the number of bits per character in a character set and the number of characters which can be represented Whole class; History of ASCII code Examples given to class of ASCII code table Understanding the different codes used within the table Exercises using the ASCII table (e.g. spell name in binary, create a letter using hex/ decimal/ binary) Research ASCII and Unicode – relationships? Differences? Explanations PPT, worksheets, WWW SEN: Help sheets and reinforcing key terms G&T: How do we enter extra characters when using a computer if there are not enough keys or combinations? G&T: What is meant by the term ‘word length’? (research and explain) How do systems agree on codes being used by the computer? What were the origins of bytes? Did it always = 8 bits? What are the differences between using an ASCII character set and a Unicode character set? 2 Images (k) explain the representation of an image as a series of pixels represented in binary (l) explain the need for metadata to be included in the file such as height, width and colour depth (m) discuss the effect of colour depth and Research; history and information on how images are formed Whole Class; Discuss findings and links between pixels and binary Discuss properties, sizes and colour depth of images Explanation of pixels and binary, resolutions, PPT, worksheets, WWW, hex image editor, image files SEN: Help sheets and reinforcing key terms G&T: Create some images, identify the properties and convert them to binary numbers What is metadata? How can an image be represented by binary numbers? What are the main factors affecting the size of an image file?