Lesson plan

Solve multiplicative comparison word problems with missing information using bar models and a division equation

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: In a multiplicative comparison, if the group size or the number of groups is unknown, this is a missing factor which can be evaluated using division. 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 determine the unknown weights using additive and multiplicative comparisons. Multiplicative comparisons will involve missing products and missing group sizes. 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 Special Materials: graph paper, linking cubes, base ten blocks