Objective: Strategize and apply understanding of the equal sign to solve equivalent expressions.
Topic C closes with Lesson 25, where students move away from the context of story problems, to find matching expressions to create true number sentences. They work solely with equations to show and talk about how they would re-represent a given addition or subtraction problem using a Level 2 or Level 3 strategy. For example, when given 9 + 6, students decompose the 6 into 1 and 5, and then can add using their new number sentence 10 + 5, (i.e., 9 + 6 = 10 + 5) (1.OA.7), using pictures and words.
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