Skill 7B
Fact Families to 10

The term fact families is used in all math textbooks.  Fact families are simply numbers that are common between the problems.  For example, with the problems below, the fact family would be the numbers four, five and nine (since these are the numbers used to make the problems).

Add or subtract.

4
+ 5

5
+ 4

9
- 5

9
- 4