Activity 6, Lesson 21, Unit 4, Grade 1 icon
Problem Set

Problem Set

Lesson 21. Unit 4. Grade 1

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This Problem Set is a part of the Lesson 21, Unit 4, Grade 1. 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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