Lesson plan

# Compare fractions with like numerators by using models

teaches Common Core State Standards CCSS.Math.Content.3.NF.A.3d http://corestandards.org/Math/Content/3/NF/A/3/d
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Big Ideas: A fraction describes the relationship between a part and the whole. Models can be used to compare fractions with the same denominator. When comparing fractions, the fractions must refer to the same whole. This lesson builds on students' work with fractions. This task uses two scenarios: one in which children are consuming pizza and one that involves spending money at the movies. First, students are presented with the amount of pizza left over after a pizza party and asked to determine who had the largest amount remaining by comparing the fractional amounts. By comparing the amounts, students reason about the size of the fraction and justify their reasoning using models. In the second portion of the lesson, students are asked to compare the fractional amount of money spent on two items at the theater. This requires reasoning about the size of the fractions to determine which child spent the most money. The mathematical concepts in this lesson build towards students' future work comparing fractions using strategies based on noticing equal numerators. Vocabulary: number line, fraction, equivalent, numerator, denominator, compare, reason, models Special Materials: Fraction strips (optional)