Objective: Use the associative and commutative properties to make ten with three addends.
This leads into Lesson 2’s focus of explicitly using the associative and commutative properties to add three addends without the context of story problems (1.OA.3). This lesson is where students practice associating the two addends that make ten (1.OA.6), and then adding the third addend; they prove to themselves that this simplification of addition is a viable strategy.
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