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Fact families

You learn to make four facts from three numbers that belong together in a fact family.

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How to work it out

  1. With three numbers you make four sums.
  2. Turn the numbers around for plus.
  3. Take away from the total for minus.
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7, 3 and 10

  1. Make the first addition sum: 7 + 3 = 10.
  2. Flip the numbers for the second addition: 3 + 7 = 10.
  3. Take away from the total for the subtractions: 10 − 3 = 7 and 10 − 7 = 3.
More examples

8, 5 and 13

  1. Add: 8 + 5 = 13 and 5 + 8 = 13.
  2. Take away from 13: 13 − 5 = 8 and 13 − 8 = 5.

25, 15 and 40

  1. Add: 25 + 15 = 40.
  2. Take away from the total: 40 − 15 = 25.