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Lesson Plan

Illustrate the unknown number in a division problem by comparing diagrams to descriptions

teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Content.3.OA.A.3 http://corestandards.org/Math/Content/3/OA/A/3
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Big Ideas: We can draw pictures and diagrams to represent equal groups and shares in order to find the unknown number in a division problem. If the total and the number of shares or equal groups are known, you can represent the unknown number with a symbol. This lesson builds on students' work with division. In this task, students become candy store owners creating store window displays of groups and shares as they discuss and compare diagrams of candy displays for the store. Matching diagrams to descriptions of displays, students solve division problems as they divide candy into same-sized groups and shares. Students reason about the relationship between multiplication and division using pictures and diagrams to represent equal groups and shares, as well as using symbols for the unknown. The mathematical concepts in this lesson build toward students’ understanding of variables. Vocabulary: dividend, divisor, quotient, unknown number, symbol Special Materials: handout "Candy Store Display Cards" (one set per student or group) scissors glue stick (optional) blank paper (optional)
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