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Lesson Plan

Add and subtract fractions with unlike denominators using the standard algorithm

teaches Common Core State Standards CCSS.Math.Content.5.NF.A.1
teaches Common Core State Standards CCSS.Math.Content.5.NF.A.2
teaches Common Core State Standards CCSS.Math.Practice.MP1
teaches Common Core State Standards CCSS.Math.Practice.MP2

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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. We can represent mathematical ideas with words and equations. This lesson builds on students' work with adding and subtracting fractions with like-denominators. This task uses a reading challenge in which students determine the amount of time students read over two nights and then find the differences between the students who read the most and least. Students need to add and subtract fractions with unlike denominators by using the standard algorithm and write equations to represent the problem. The mathematical concepts in this lesson build toward future use in solving ratio, rate, and proportion problems. They also prepare students for work with greatest common factors and least common multiples in 6th grade algebra. Vocabulary: numerator, unlike and like denominator, algorithm, variable, equation, expression
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