Math Intervention 3–5 Grade

Addition and Subtraction Concepts 75

What are Addition and Subtraction Fact Families?

Fact families for addition and subtraction are facts that

are directly related. In a fact family, there are two addition

problems and two subtraction problems. The addition

facts are manifestations of the commutative property. The

subtraction facts are inverse operations of the addition facts.

CCSS

Operations and Algebraic Thinking

Formative Assessment

To fi nd out if a student understands addition and subtraction

fact families, provide the following incomplete fact family

and ask the student which fact is missing from the family.

8 + 4 = 12

12 – 4 = 8

12 – 8 = 4

If the student is not successful, try a smaller fact family. If the

student is successful, ask her to generate all of the facts in the

7, 8, 15 fact family.

Fact Families—Addition and Subtraction

CONCEPT: