Lesson plan

Interpret division as an unknown factor problem by using a bar model

teaches Common Core State Standards CCSS.Math.Content.3.OA.B.6 http://corestandards.org/Math/Content/3/OA/B/6
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Idea: You can divide the whole into equal-sized parts by finding the unknown factor (number of pieces, size of each piece). This lesson builds on students' understanding of the relationship between multiplication and division and solving for an unknown number. This task uses a sandwich shop scenario where students divide sandwiches into equal shares. Using a bar model, students partition sandwiches to determine the number of pieces based on the size of the piece, and the size of the piece based on the number of pieces. The mathematical concepts in this lesson build toward students’ understanding of the properties of operations. Vocabulary: unknown factor, quotient, divisor, bar model Special Materials: colored construction paper strips (optional) number line (optional)