Unit 4, Lesson 21

Recognize and make use of part–whole relationships within tape diagrams when solving a variety of problem types.

EngageNY 60 min(s)
In this lesson, students continue solving "put together/take apart with addend unknown" and "add to with change unknown" word problems within 20. As in the previous lesson, they share their strategies for drawing when a part is unknown, and continue to work on recognizing what kind of unknown they are looking for--a part or a total.

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