Topic B introduces units of 6 and 7, factors that are well suited to Level 2 skip-counting strategies and to the Level 3 distributive property strategy, already familiar from Module 1. Students learn to compose up to, then over the next decade. For example, to solve a fact using units of 7 they might count 7, 14, and then mentally add 14 + 6 + 1 to make 21. This strategy previews the associative property using addition and illuminates arithmetic patterns as students apply count-bys to solve problems (3.OA.9). In the next lesson, students apply the distributive property (familiar from Module 1) as a strategy to multiply and divide. They decompose larger unknown facts into smaller known facts to solve. For example, 48 ÷ 6 becomes (30 ÷ 6) + (18 ÷ 6), or 5 + 3 (3.OA.5, 3.OA.7). Topic B’s final lesson emphasizes word problems, providing opportunities to analyze and model. Students apply the skill of using a letter to represent the unknown in various positions within multiplication and division problems (3.OA.3, 3.OA.4, 3.OA.7).
Grade 3 Mathematics Module 3, Topic B, Overview
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Common Core Learning Standards
|3.OA.3||Use multiplication and division within 100 to solve word problems in situations involving equal...|
|3.OA.4||Determine the unknown whole number in a multiplication or division equation relating three whole...|
|3.OA.5||Apply properties of operations as strategies to multiply and divide.2 Examples: If 6 × 4 = 24 is...|