Lesson Plan

Solve multiplicative comparison problems with an unknown product by using bar models

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 the height of a landmark structure in comparison to the given height of an ancient structure. Students will problem solve and use various mathematical models to solve a multiplicative comparison with an unknown product. This builds toward using equations with a symbol for the unknown to solve word problems with an unknown product. Vocabulary: multiplicative comparison, product, factor, bar model Special Materials: Base Ten Blocks Graph paper
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