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Cakes and Calculations Year 5

Cakes and Calculations Year 5. Multiplication. Mental Strategies for Multiplication. Multiply a 2-digit number by 4 by repeated doubling (double then double again) e.g. 26 x 4 Multiply a 2-digit number by 20 (multiply by 10 then double) e.g. 14 x 20

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Cakes and Calculations Year 5

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  1. Cakes and Calculations Year 5 Multiplication

  2. Mental Strategies for Multiplication • Multiply a 2-digit number by 4 by repeated doubling (double then double again) e.g. 26 x 4 • Multiply a 2-digit number by 20 (multiply by 10 then double) e.g. 14 x 20 • Use knowledge of multiplication and division facts when calculating with multiples of 10 e.g. 15 x 40 15 x 4 = 60 60 x 10 =600 or 150 x 4 = 600

  3. Written methods for Multiplication Stage 1 – TU x U (Partitioning) 14 x 3 = (10 x 3) + (4 x 3) = 30 + 12 = 42

  4. Written methods for Multiplication Stage 2 – TU x U and TU x TU (Grid Method)

  5. Written methods for Multiplication Stage 3 – Expanded Short Multiplication

  6. Written methods for Multiplication Stage 4 – Short Multiplication

  7. Over to you!

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