Lesson plan

Demonstrate understanding of the commutative property by using arrays

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.7c http://corestandards.org/Math/Content/3/MD/C/7/c
teaches Common Core State Standards CCSS.Math.Content.3.OA.B.5 http://corestandards.org/Math/Content/3/OA/B/5

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Big Ideas: Two factors multiplied together make a product and the order of the factors does not matter; they will still equal the same product. This lesson builds on students’ understanding of the commutative property. Students have experienced this property with addition and have arranged rectangular arrays to show repeated addition as multiplication. The task in the lesson asks students to prove that the order of the factors in a multiplication number sentence does not change the outcome, which is the big idea of the lesson. The mathematical concepts in this lesson build towards students’ future work with multiplying and dividing larger numbers using multiple strategies. Vocabulary: factors, product, array, commutative property Special Materials: two-sided counters