In this lesson, students use the "make ten" strategy. For example, to add 9 + 4, students decompose 4 as 1 and 3 in order to complete a unit of ten (9 + 1) and then add, or compose, the ten with the remaining ones (10 + 3).

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Unit 1, Lesson 3

Unit 1, Lesson 5

Unit 1, Lesson 1