This Problem Set is a part of the Lesson 28, Unit 2, Grade 1. In this lesson, students solve addition problems that result in a sum composed of 1 ten and some ones using the "make a ten" strategy, and record their thinking with two equations. For example, they recognize how to add 8 + 4 with the equations 8 + 2 = 10 and 10 + 2 = 14.
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