Objective: Solve add to with change unknown math stories with addition and relate to subtraction. Model with materials and write corresponding number sentences.
In Lesson 25, students solve add to with change unknown problems as they did in Topic C using addition but now relate that work directly to the act of taking away (1.OA.4). The work of this lesson starts with students calling upon their knowledge from previous add to with change unknown problems and then applying it in the context of subtraction, using the addend to subtract from the total in order to find the missing addend or part (1.OA.1).
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