What is a fact family?

A fact family is a set of math facts that uses the same numbers in different ways to create related addition and subtraction problems. For example, the fact family for the numbers 3, 5, and 8 would include the following equations:

3 + 5 = 8 5 + 3 = 8 8 - 5 = 3 8 - 3 = 5

Fact families are often used in elementary math education to help students understand the relationship between addition and subtraction and to practice basic math facts. By recognizing the patterns and connections within a fact family, students can develop stronger number sense and problem-solving skills.