Lesson plan

Solve multiplicative comparison word problems with an unknown product by using a two-column chart

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 2 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 greatest number of cakes that can be made from no more that $7 worth of flour, with the least possible amount of flour left over. Students will organize their mathematical thinking in order to arrive at and justify their solutions. This builds toward solving word problems involving multiplicative comparisons involving the conversion of standard measurements from a larger unit to a smaller unit. Vocabulary: multiplicative comparison, factor, product, two-column chart, per Special Materials: counters, money, graph paper