Grade 3 Mathematics Module 3, Topic B, Overview

Girl in Classroom

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).

Downloadable Resources

Resources may contain links to sites external to the website. These sites may not be within the jurisdiction of NYSED and in such cases NYSED is not responsible for its content.

Common Core Learning Standards

CCLS State Standard
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...

Curriculum Map