Unit 1, Lesson 9# Find related multiplication facts by adding and subtracting equal groups in array models

EngageNY 60 min(s)

This lesson introduces the distributive property as a strategy for multiplication. Students use arrays to decompose unknown facts as the sum or difference of two known facts. For example, they analyze an array to see that 7 × 3 can be decomposed as 2 rows of 3 and 5 rows of 3.