Lesson plan

Understand that the size of a product depends on the size of the factors

teaches Common Core State Standards CCSS.Math.Content.5.NF.B.5b http://corestandards.org/Math/Content/5/NF/B/5/b
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: Understand that multiplication does not always result in a product that is bigger than the factors. The size of the products depends upon the value of the factors in relation to 1. In this lesson students are asked to reconsider everything they know about multiplication. In the task, they determine how the size of the factors affects the size of the product. Students will be asked to evaluate which factors can be multiplied to produce a product that is more than, less than, or equal to one or both of its factors. Experimenting with these different factor-product relationships helps dispel misconceptions and overgeneralizations about multiplication. The mathematical concepts in this lesson build toward students' future work with, and understanding of, multiplying fractions and scaling. Vocabulary: factors, products Special Materials: Class set of attached sorting cards for task activity Scissors Glue