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Inverse Relationship and Fact Families
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Inverse Relationship - An inverse operation
"reverses" another operation. Addition and subtraction are inverses of
each. If you start with 5, add 3 to get 8, then the inverse would be to
subtract 3 from 8 go back to where you started, that is to 5. 5+3=8 inverse 8-3=5 What are fact families? Fact families are 3 numbers that are related, just as the people in a family are related. They make a set of related math facts. |
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Add
and subtract with fact family cards. 
3 + 5 = 8 8 - 3 = 5 |