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Lesson Plan

Subtract mixed numbers with unlike denominators by using area models

teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
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.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: Since 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 subtracting mixed numbers with like denominators. This task asks students to subtract mixed numbers with unlike denominators to determine the difference in the weight of fish. The mathematical concept in this lesson builds toward future use with 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 mixed number improper fraction fishmonger: someone who sells raw fish or seafood Special Materials: color pencils (optional)
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