Unit 4, Lesson 14# Use counting on and the make ten strategy when adding across a ten.

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In this lesson, students use arrow notation to reach the next ten, and then add the remaining amount when adding across ten. For example, when adding 28 + 6, students recognize that they started with 2 tens 8 ones and, after adding 6, had 3 tens 4 ones. Throughout the lesson, students use number bond notation to represent how they are breaking apart the second addend to make the ten.