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Year 1 · Subtraction

Subtract within 20

Subtracting means taking away. Past 10, it helps to count back to 10 first.

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How to do it

  1. Start at the bigger number.
  2. Count back to 10.
  3. Count back the rest.

Worked example

13 − 5
13 − 3 = 10, then 2 more back.
13 − 5 = 8

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Count the jumps, not the numbers you say.

Practise Subtract within 20 properly

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