Unit 1, Lesson 4# Make a ten to add within 20

EngageNY 60 min(s)

In this lesson, students use the "make ten" strategy. For example, to add 9 + 4, students decompose 4 as 1 and 3 in order to complete a unit of ten (9 + 1) and then add, or compose, the ten with the remaining ones (10 + 3).