Definition
A fact family is a group of related math facts that use the same set of numbers. Addition and subtraction form one type, and multiplication and division form another.
A fact family is like a family of relatives. The same three numbers are related in four different ways, just as family members are connected by different relationships.
Examples
- 3, 4, 7 make a fact family: 3 + 4 = 7, 4 + 3 = 7, 7 - 3 = 4, 7 - 4 = 3.
- 2, 5, 10: 2 x 5 = 10, 5 x 2 = 10, 10 / 2 = 5, 10 / 5 = 2.
- 6, 8, 14: 6 + 8 = 14, 8 + 6 = 14, 14 - 6 = 8, 14 - 8 = 6.