Inverse Relationship Between Addition and Subtraction
- Why should I learn the facts?
If you know one fact in a fact family, you can find the other facts. So, if you forget one fact, you have a tool to find others.
- How are facts related?
They use the same three numbers.
- Do all families have 4 facts?
No, doubles have only two facts in their families; one addition fact and one subtraction fact.
- What is a fact family?
Addition and subtraction facts that belong together because they have all the same numbers.