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Fact families
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Learn it Three numbers make a fact family: two addition facts and two subtraction facts.
Example: Write the fact family for 3, 5 and 8.
- $3 + 5 = 8$ and $5 + 3 = 8$.
- $8 - 3 = 5$ and $8 - 5 = 3$.
- Subtraction undoes addition.
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