(Draft) Strategies and Methods Subtraction – Year 5 Year 6 Taking away Taking away Use place value to subtract decimals Use place value to subtract decimals e.g. e.g. 4·58 0·08 7·782 0·08 – – e.g. e.g. 6·26 0·2 16·263 0·2 – – Take away multiples of powers of 10 Take away multiples of powers of 10 e.g. e.g. 15 672 300 132 956 400 – – e.g. e.g. 4·82 2 686 109 40 000 – – e.g. e.g. 2·71 0·5 7·823 0·5 – – e.g. Partitioning or counting back 4·68 0·02 – e.g. Partitioning or counting back 3964 1051 – e.g. e.g. 3964 1051 5·72 2·01 – – e.g. Subtract near multiples of powers of 10 5·72 2·01 – e.g. Subtract near multiples of 1, 10, 100, 1000, 10 000 or £1 360 078 99 998 – e.g. e.g. 86 456 9999 12·831 0·99 – – e.g. 3·58 1·99 – Counting up Subtraction Find a difference between two numbers by counting up from the smaller to the larger e.g. £12·05 £9·59 − Mental e.g. 2009 869 –
Mental Subtraction Strategies and Methods – Subtraction (Draft) Year 5 Year 6 Taking away Taking away Use place value to subtract decimals Use place value to subtract decimals e.g. 4·58 – 0·08 e.g. 7·782 – 0·08 e.g. 6·26 – 0·2 e.g. 16·263 – 0·2 Take away multiples of powers of 10 Take away multiples of powers of 10 e.g. 15 672 – 300 e.g. 132 956 – 400 e.g. 4·82 – 2 e.g. 686 109 – 40 000 e.g. 2·71 – 0·5 e.g. 7·823 – 0·5 e.g. 4·68 – 0·02 Partitioning or counting back Partitioning or counting back e.g. 3964 – 1051 e.g. 3964 – 1051 e.g. 5·72 – 2·01 e.g. 5·72 – 2·01 Subtract near multiples of powers of 10 Subtract near multiples of 1, 10, 100, 1000, 10 000 or £1 e.g. 360 078 – 99 998 e.g. 86 456 – 9999 e.g. 12·831 – 0·99 e.g. 3·58 – 1·99 Counting up Find a difference between two numbers by counting up from the smaller to the larger e.g. £12·05 − £9·59 e.g. 2009 – 869
Abacus_KS2_Calculations_Overview.docx