Lesson plan

Compose a whole by combining unit fractions on a number line

teaches Common Core State Standards CCSS.Math.Content.3.NF.A.2a http://corestandards.org/Math/Content/3/NF/A/2/a
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Big Ideas: The denominator is the number of equal segments on a number line between 0 and 1. The denominator tells the number of unit fractions needed in a whole. This lesson builds on students’ work with partitioning area models and number lines into equal shares. This task involves a scenario where students are working with the author of a children's book to create and justify solutions of a whole on a number line with their knowledge of unit fractions. Students will be asked to generate a whole on a number line using the given unit fractions. Students will be building and applying their foundational knowledge of fractions to compose a whole with unit fractions. The mathematical concepts in this lesson build toward students’ future work with composing and decomposing fractions, naming fractions on a number line, comparing fractions, and equivalent fractions. Vocabulary: fraction, unit fraction, whole, denominator, numerator Special Materials: Generate a whole with number lines on grid paper (Supplemental Handout) fraction bars (optional) ruler (optional)