Lesson plan

Solve multiplicative comparison word problems with unknown products by using equations with a symbol for the unknown

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 multiplicative comparisons focus on comparing two quantities by showing that a quantity is a specified number of times larger than the other. This lesson builds on students' understanding of multiplicative comparison. The task asks students to determine weights of pets using clues about the weight of one pet in relationship to another. Students will problem solve and use various mathematical models to solve comparisons. This builds toward using two-column charts to solve word problems with an unknown product. Vocabulary: multiplicative comparison, product, factor, bar model Special Materials: Base ten blocks, graph paper, linking cubes