Stage 3 Add numbers with up to 3-digits Introduce the expanded column addition method: Add the units first, in preparation for the compact method. In order to carry out this method of addition: Children need to recognise the of the  hundreds, tens and units without recording the partitioning. Pupils need to be able to add in columns.  Move to the compact column addition method, with „carrying‟: who are very secure and confident with 3-digit 236 expanded column addition should be moved onto the compact Add units first. the column addition method, being introduced to for „carrying‟ + 73 first time. Compare the expanded method to the compact column method to develop an understanding of the numbers „Carry‟ 309 process and the reduced number of steps involved. underneath the 1 bottom line. Remind pupils the actual is tens add seven „three not add seven‟, which equals ten tens. tens‘, Key vocabulary: add, more, plus, and, make, altogether, total, equal to, equals, double, most, count on, number line, sum, tens, units, partition, plus, addition, column, tens boundary, hundreds boundary, increase, vertical, expanded, compact ‗carry‘, Key skills for addition at Y3: Read and write numbers to 1000 in numerals and words.  Add 2-digit numbers mentally, incl. those exceeding 100.  Add a three-digit number and ones mentally (175 + 8)  Add a three-digit number and tens mentally (249 + 50)   Add a three-digit number and hundreds mentally (381 + 400) Estimate answers to calculations, inverse to check answers.  Solve problems, including missing number problems, using  number facts, place value, and more complex addition.  Recognise place value of each digit in 3-digit numbers (hundreds, tens, ones.)  Continue to practise a wide range of mental addition strategies, ie. number bonds, adding the nearest  multiple of 10, 100, 100 and adjusting, using near doubles, partitioning and recombining. Video clip:
Stage 3 Add numbers with up to 3-digits Introduce the expanded column addition method: Add the units first, in preparation for the compact method. In order to carry out this method of addition:  Children need to recognise the of the hundreds, tens and units without recording the partitioning.  Pupils need to be able to add in columns. Move to the compact column addition method, with „carrying‟: Add units first. „Carry‟ numbers underneath the bottom line. 236 + 73 309 1 who are very secure and confident with 3-digit expanded column addition should be moved onto the compact column addition method, being introduced to „carrying‟ for the first time. Compare the expanded method to the compact column method to develop an understanding of the process and the reduced number of steps involved. Remind pupils the actual is „three tens add seven tens‘, not add seven‟, which equals ten tens. Key vocabulary: add, more, plus, and, make, altogether, total, equal to, equals, double, most, count on, number line, sum, tens, units, partition, plus, addition, column, tens boundary, hundreds boundary, increase, vertical, ‗carry‘, expanded, compact Key skills for addition at Y3:  Read and write numbers to 1000 in numerals and words.  Add 2-digit numbers mentally, incl. those exceeding 100.  Add a three-digit number and ones mentally (175 + 8)  Add a three-digit number and tens mentally (249 + 50)  Add a three-digit number and hundreds mentally (381 + 400)  Estimate answers to calculations, inverse to check answers.  Solve problems, including missing number problems, using  number facts, place value, and more complex addition.  Recognise place value of each digit in 3-digit numbers (hundreds, tens, ones.)  Continue to practise a wide range of mental addition strategies, ie. number bonds, adding the nearest multiple of 10, 100, 100 and adjusting, using near doubles, partitioning and recombining. Video clip: