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Multiplying by 2, doubling and halving (factors and products)

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Why this, why now

In this unit pupils will learn how multiplication with 2 as a factor relates to doubling and how we can see halving as the inverse of doubling, deriving the related halving fact from a known double.

Prior knowledge requirements

  • Ardaydu waa inay yaqaanaan aasaaska maadada.
  • Ardaydu waa inay awoodaan inay raacaan tilmaamo fudud.
Unit 10 / 19

Multiplying by 2, doubling and halving (factors and products)

In this unit pupils will learn how multiplication with 2 as a factor relates to doubling and how we can see halving as the inverse of doubling, deriving the related halving fact from a known double.

5 lessons
  1. Halve even 2-digit numbers and multiples of 10
  2. Use knowledge of doubling, halving and the 2 times table to solve problems
  3. Identify missing factors when one factor is 2
  4. Double 2-digit numbers and record as multiplications where one of the factors is 2
  5. Explain how doubling and halving are related