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Year 1 · Addition

Addition and subtraction fact families

A fact family is four facts that use the same three numbers.

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How to do it

  1. Take the two small numbers and the big one.
  2. Addition: small + small = big (both ways).
  3. Subtraction: big − small = the other small (both ways).

Worked example

3, 5 and 8
3 + 5 = 8, 5 + 3 = 8
8 − 3 = 5, 8 − 5 = 3

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The big number is always first in a subtraction.

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