## Lesson 6: Subtraction and Fact families

**Parts of Subtraction Problem: Number Sentence**

6 - 2 = 4

Subtrahends Difference

**Fact Families**

* Group of three numbers that can be arranged to form four facts.

Examples: 2, 4, 6

2 + 4 = 6

4 + 2= 6

6 - 4= 2

6 - 2= 4