NOTE: Pupils should memorise and reason with Pupils should become familiar with the terms: put number bonds to 10 and 20. together, add, altogether, total, take away, distance Use of structured materials between, difference between, more than and less than such as ten frames may so they develop the concept of addition and subtraction support this and reduce and can use these operations flexibly. dependence on count by ones strategies. Addition Subtraction Strategy Number lines Number lines sentences sentences Counting 8 + 3 = 11 9 – 2 = 7 on/back Reordering: 3 + 8 = Reorder before on rewrite as using number line from larger 8 + 3 = 11 as above number Find pairs 3 + 4 + 7 = that total 3 + 7 + 4 = 10 10 + 4 = 14 Partition 5 + 8 = into 5 and a 5 + 5 + 3 = bit 10 + 3 = 13 7 + 8 = 5 + 2 + 5 + 3 = 5 + 5 + 2 + 3 = 10 + 5 = 15 5 + 6 = Use near 5 + 5 + 1 = doubles 10 + 1 = 11 – Begin to 6 + 7 = 13 7 = – – bridge 6 + 4 + 3 = 13 3 4 = – through 10 10 + 3 = 13 10 4 = 6 18 + 5 = 25 – 8 = 18 + 2 + 3 = 25 – 5 – 3 = 20 + 3 = 23 20 – 3 = 17
NOTE: Pupils should memorise and reason with number bonds to 10 and 20. Use of structured materials such as ten frames may support this and reduce dependence on count by ones strategies. Pupils should become familiar with the terms: put together, add, altogether, total, take away, distance between, difference between, more than and less than so they develop the concept of addition and subtraction and can use these operations flexibly. Strategy Addition sentences Number lines Subtraction sentences Number lines Counting on/back 8 + 3 = 11 9 – 2 = 7 Reordering: on from larger number 3 + 8 = rewrite as 8 + 3 = 11 Reorder before using number line as above Find pairs that total 10 3 + 4 + 7 = 3 + 7 + 4 = 10 + 4 = 14 Partition into 5 and a bit 5 + 8 = 5 + 5 + 3 = 10 + 3 = 13 7 + 8 = 5 + 2 + 5 + 3 = 5 + 5 + 2 + 3 = 10 + 5 = 15 Use near doubles 5 + 6 = 5 + 5 + 1 = 10 + 1 = 11 Begin to bridge through 10 6 + 7 = 6 + 4 + 3 = 10 + 3 = 13 13 – 7 = 13 – 3 – 4 = 10 – 4 = 6 18 + 5 = 18 + 2 + 3 = 20 + 3 = 23 25 – 8 = 25 – 5 – 3 = 20 – 3 = 17