# Number Sense: Fact Families (Multiplication and Division)

Fact families are sets of problems and their inverses (so, 1x2=2, 2x1=2, 2÷1=2, and 2÷2=1). Because multiplication and division problems are related, students really only need to memorize one set of facts to know three sets of facts. However, some students needs practice to see and understand how multiplication and division problems relate to each other. This set of practice problems helps students build that understanding slowly, by first asking students to fill in blanks and then asking students to create entire fact families. Fact families focus on multiplication and division facts up to 100.

*After reading the multiplication problems below, complete the related division problems.*

4 x 5 = 20

So, 20 ÷ 5 = _____

And, 20 ÷ 4 = ______

*B**ased on the one problem shown, write the other three math problems that complete the fact family.*

6 x 2 = 12

___ x ___ = ___

___ ÷ ___ = ___

___ ÷ ___ = ___