Objective: Look for and make use of repeated reasoning and structure using the addition chart to solve subtraction problems.
Students spend Lesson 38 exploring the addition chart (similar to Topic F) and looking for patterns within the context of subtraction (MP.7, MP.8, 1.OA.6). When presented with a subtraction equation such as 7 – 3, students then use their knowledge of the decompositions of 7 to help them solve, and discuss to find related addition equations on the addition chart such as 3 + 4 or 4 + 3.
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