Unit 1, Lesson 39# Analyze the addition chart to create sets of related addition and subtraction facts.

EngageNY 60 min(s)

In this lesson, students apply their knowledge of addition and subtraction to write groups of four related addition and subtraction equations. For example, given the expression 5 + 2, students write the addition equations 5 + 2 = 7 and 2 + 5 = 7, and then write the related subtraction equations 7 - 5 = 2 and 7 - 2 = 5.