(Draft) Strategies and Methods Subtraction – Year 3 Year 4 Taking away Taking away Use place value to subtract Use place value to subtract 4 7 4 8 e.g. e.g. 348 300 4748 4000 – – 3 4 8 e.g. e.g. 348 40 4748 8 – – e.g. Take away multiples of 10, 100, 1000, £1, 10p or 0·1 348 8 – Take away multiples of 10, 100 and £1 e.g. 8392 50 – e.g. e.g. 476 40 = 436 6723 3000 – – e.g. e.g. 476 300 = 176 £3·74 30p – – e.g e.g. £4·76 £2 = £2·76 5·6 0·2 – – Partitioning Partitioning e.g. e.g. 68 42 as 60 40 and 8 2 £5·87 £3·04 as £5 £3 and 7p 4p – – – – – – e.g. e.g. £6·84 £2·40 as £6 £2 and 80p 40p 7493 2020 as 7000 2000 and 90 20 – – – – – – Subtraction 7 000 2 000 – 7 4 9 3 – 20 20 5 4 7 3 90 20 – Mental Count back e.g. 6482 1301 as 6482 1000 (5482) 300 (5182) 1 = 5181 – – – – Subtract near multiples of 10, 100, 1000 or £1 e.g. 3522 1999 – e.g. £34·86 £19·99 –
Mental Subtraction Strategies and Methods – Subtraction (Draft) Year 3 Year 4 Taking away Taking away Use place value to subtract Use place value to subtract 4 7 4 8 e.g. 348 – 300 e.g. 4748 – 4000 3 4 8 e.g. 348 – 40 e.g. 4748 – 8 e.g. 348 – 8 Take away multiples of 10, 100, 1000, £1, 10p or 0·1 Take away multiples of 10, 100 and £1 e.g. 8392 – 50 e.g. 476 – 40 = 436 e.g. 6723 – 3000 e.g. 476 – 300 = 176 e.g. £3·74 – 30p e.g £4·76 – £2 = £2·76 e.g. 5·6 – 0·2 Partitioning Partitioning e.g. 68 – 42 as 60 – 40 and 8 – 2 e.g. £5·87 – £3·04 as £5 – £3 and 7p – 4p e.g. £6·84 – £2·40 as £6 – £2 and 80p – 40p e.g. 7493 – 2020 as 7000 – 2000 and 90 – 20 7 000 – 2 000 7 4 9 3 – 20 20 90 – 20 5 4 7 3 Count back e.g. 6482 – 1301 as 6482 – 1000 (5482) – 300 (5182) – 1 = 5181 Subtract near multiples of 10, 100, 1000 or £1 e.g. 3522 – 1999 e.g. £34·86 – £19·99
Abacus_KS2_Calculations_Overview.docx