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Lesson Plan

Add and subtract mixed numbers with unlike denominators by using number lines

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: Finding equivalent fractions allows us to add or subtract mixed numbers. This lesson builds on students' work with adding and subtracting mixed numbers with like denominators and number lines. This task asks students to determine if the girls or boys use their pencils more. Students add and subtract mixed numbers with unlike denominators to find the sums and differences of the pencil’s length using number lines. This lesson builds toward future study of ratio, rate, and proportion problems, and prepares students for work with greatest common factors and least common multiples in 6th grade algebra. Vocabulary: number lines, numerator, unlike and like denominator, mixed number, improper fraction Special Materials: color pencils (optional) rulers (optional)
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