Unit 2, Lesson 22# Solve put together/take apart with addend unknown word problems and relate counting on to the take from ten strategy.

EngageNY 60 min(s)

In this lesson, students solve "put together/take apart with addend unknown" word problems such as, "Maria has 15 baseballs. 8 of them are old, and some of them are brand new. How many brand-new baseballs does Maria have?" Students solve these problems using both the "counting on" strategy and more advanced subtraction strategies.