Lesson plan

Divide fractions by converting to equivalent multiplicative expressions

teaches Common Core State Standards CCSS.Math.Content.7.NS.A.3 http://corestandards.org/Math/Content/7/NS/A/3
teaches Common Core State Standards CCSS.Math.Content.7.RP.A.1 http://corestandards.org/Math/Content/7/RP/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Big Ideas: Rational numbers can be used to describe real-world contexts and can be multiplied and divided. A fraction division calculation can be changed to an equivalent multiplication calculation. This lesson builds upon students' work with division. In this task, students will find and use the appropriate scale factor to adjust a cookie recipe. Finally, by dividing by the reciprocal of the scale factor, students will reason that the division of rational numbers by fractions is equivalent to multiplication by the reciprocal of the divisor. This lesson builds towards students' future work with simplifying expressions and solving equations. Vocabulary: reciprocal, multiplicative inverse Special Materials: None