Lesson plan

Solve multiplicative comparison problems with an unknown multiplier by using bar models and division equations

teaches Common Core State Standards CCSS.Math.Content.4.NBT.A.3 http://corestandards.org/Math/Content/4/NBT/A/3
teaches Common Core State Standards CCSS.Math.Content.4.OA.A.2 http://corestandards.org/Math/Content/4/OA/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Big Ideas: Understand that in a multiplicative comparison, if the multiplier is unknown, this is a missing factor, which can be solved with division. Understand that multiplying by x is the inverse of dividing by x. This lesson builds on students' understanding of multiplicative comparison and the inverse relationship between multiplication and division. The task asks students to compare the growth rates of two trees. This lesson builds toward solving multiplicative comparison word problems with the unknown in any position. Vocabulary: multiplicative comparison, factor, product, division, inverse, quotient, group size, multiplier Special Materials: graph paper, linking cubes, base ten blocks