Number Bond Addition and Subtraction

This Fluency Activity is a part of the Lesson 21, Unit 4, Grade 1.<br> 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.