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Lesson Plan

Apply understanding of decimal multiplication using an area model

teaches Common Core State Standards CCSS.Math.Content.5.NBT.B.7
teaches Common Core State Standards CCSS.Math.Practice.MP2
teaches Common Core State Standards CCSS.Math.Practice.MP4
teaches Common Core State Standards CCSS.Math.Practice.MP5
teaches Common Core State Standards CCSS.Math.Practice.MP7

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Big Ideas: Decomposing a decimal is the same as decomposing a whole number. Multiplying by a decimal will result in a smaller product. Area is the amount of space a figure covers. In this task, students are asked to find the area of a given rectangular space and choose grass options that will cover that area. Students will apply their understanding of multiplication and area concepts to complete the task. This work builds on the work students have done with multiplying whole numbers by fractions. The mathematical concepts in this lesson build toward students’ future work with multiplying rational numbers and proportional reasoning in grades 6-8. Vocabulary: area, product, length, width, decompose, area model, partial products Special Materials: Grid paper
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