(Draft) of Strategies and Methods Subtraction – Year 3 Year 4 Using number facts Using number facts Know pairs which total each number to 20 Number bonds to 10 and 100 and derived facts e.g. = 6 e.g. 20 14 100 76 = 24 – – e.g. Number bonds to 100 1 0·6 = 0·4 – e.g. 100 48 = 52 – e.g. 100 35 = 65 – 0 1 Subtraction Number bonds to £1 and £10 Subtract using number facts to bridge back through a 10 e.g. £1·00 86p = 14p – Mental e.g. e.g. 42 5 = 42 2 (40) 3 = 37 £10·00 £3·40 = £6·60 – – – – Develop counting up subtraction Expanded column subtraction with 3- and 4-digit numbers e.g. e.g. 200 167 726 358 – – Begin to develop compact column subtraction e.g. Subtraction 726 358 – Written
Mental Subtraction Written Subtraction of Strategies and Methods – Subtraction (Draft) Year 3 Year 4 Using number facts Using number facts Know pairs which total each number to 20 Number bonds to 10 and 100 and derived facts e.g. 20 – 14 = 6 e.g. 100 – 76 = 24 Number bonds to 100 e.g. 1 – 0·6 = 0·4 e.g. 100 – 48 = 52 e.g. 100 – 35 = 65 0 1 Number bonds to £1 and £10 Subtract using number facts to bridge back through a 10 e.g. £1·00 – 86p = 14p e.g. 42 – 5 = 42 – 2 (40) – 3 = 37 e.g. £10·00 – £3·40 = £6·60 Develop counting up subtraction Expanded column subtraction with 3- and 4-digit numbers e.g. 200 – 167 e.g. 726 – 358 Begin to develop compact column subtraction e.g. 726 – 358
Abacus_KS2_Calculations_Overview.docx