Mult div strategies L5 to L8

Mult div strategies L5 to L8

• 1.
  Reference: Ministry ofEducation (2008). The Number Framework—Book 1. Stage 5 Early Additive I can solve multiplication and division problems using repeated addition or known addition facts. eg. 4 x 6 = (6 + 6) + (6 + 6) = 12 + 12 = 24 I can solve multiplication and division problems using know simple multiplication facts or repeated halving. eg. 20 ÷ 4 = 1/2 of 20 = 10 and 1/2 of 10 = 5 so 4 x 5 = 20 Multiplication & Division I know x2, x5 and x10 multiplication facts and matching division facts.
• 2.
  Reference: Ministry ofEducation (2008). The Number Framework—Book 1. Stage 6 Advanced Additive Multiplication & Division I can solve multiplication and division problems by using known facts and mental strategies to derive the answers. I know multiplication facts with tens, hundreds and thousands. I know multiplication facts to x10 tables and some matching division facts. Place value 13 x 5 = (10 x 5) + (3 x 5) = 65 Rounding and compensating 3 x 18 = 3 x 20—6 Using known facts 3 x 6 so 2 x 6 + 6 = 18 Doubling 4 x 7 as 2 x 7 = 14 so 4 x 7 = 28 Doubling and halving 4 x 8 = 2 x 16 = 32 Halving 36 ÷ 4 as 1/2 of 36 = 18 and 1/2 of 18 = 9 Reversibility 63 ÷ 9 as 9 x = 63
• 3.
  Reference: Ministry ofEducation (2008). The Number Framework—Book 1. Stage 7Advanced Multiplicative Multiplication & Division I know divisibility rules for 2, 3, 5, 9, 10 I know division facts up to x 10 tables. Possible strategies for 24 x 6 Place value partitioning (20 x 6) + ( 4 x 6) Rounding and compensating 25 x 6—6 Doubling and halving 24 x 6 = 12 x 12 Vertical Algorithm I can explain the place value partitioning involved I can choose appropriately from a range of mental strategies to solve multiplication and division problems. I know common multiples of numbers to 10. I know square numbers to 100 and the responding square roots. Possible strategies for 201 ÷ 3 by using reversibility Place value partitioning (3 x 60) + (3 x 7) so 67 cans Rounding and compensating (3 x 70) — (3 x 3) so 67 cans Divisibility 33 threes in 100 with 1 left over so 33 + 33 + 1 = 67 cans Vertical Algorithm I can explain the place value partitioning involved I know factors of numbers to 100 including prime numbers.
• 4.
  Reference: Ministry ofEducation (2008). The Number Framework—Book 1. Stage 8 Advanced Proportional Multiplication & Division I know divisibility rules for 2, 3, 4, 5, 6, 8, and 10. I know simple powers of numbers to 10. For example; 3.6 x 0.75 = 3/4 x 3.6 = 2.7 (Conversion and commutativity) I know common factors of numbers to 100, including the highest common factor. ( I can choose appropriately from a range of mental strategies to solve division problems with decimals. I know least common multiples of numbers to 10. I know fractions—decimal— percentage conversions for given fractions and decimals. I can choose appropriately from a range of mental strategies to solve problems that involve multiplication of fractions and decimals. For example; 7.2 ÷ 0.4 as 7.2 ÷ 0.8 = 9, so 7.2 ÷ 0.4 = 18 (Doubling and halving with place value)