Lesson plan

Add fractions with unlike denominators by using area models

teaches Common Core State Standards CCSS.Math.Content.5.NF.A.1 http://corestandards.org/Math/Content/5/NF/A/1
teaches Common Core State Standards CCSS.Math.Content.5.NF.A.2 http://corestandards.org/Math/Content/5/NF/A/2
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.MP4 http://corestandards.org/Math/Practice/MP4

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Big Ideas: Because fractions are representations of equal parts, they can only be added or subtracted when those parts are of the same size or value. This lesson builds on students' work with adding fractions with like denominators. In this task, Sophia is adding fractions with unlike denominators to determine what two activities she spends at least half her day on. The mathematical concept in this lesson builds toward future work solving ratio, rate, and proportion problems, and prepares students for work with greatest common factors and least common multiples in 6th grade algebra. Vocabulary: area model, numerator, unlike and like denominator, vertical, horizontal Special Materials: Colored pencils (optional)