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.