Lesson plan

6. Combine unit fractions to create new fractions (FP)

teaches Common Core State Standards CCSS.Math.Content.3.NF.A.1 http://corestandards.org/Math/Content/3/NF/A/1
teaches Common Core State Standards CCSS.Math.Content.3.NF.A.2 http://corestandards.org/Math/Content/3/NF/A/2
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.MP6 http://corestandards.org/Math/Practice/MP6

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Lesson objective: Create new fractions using unit fractions.

This lesson helps to build procedural skill with iterating unit fractions to create other fractions. Tape diagrams and number lines are used here because they support that, no matter what the representation, unit fractions can be iterated to find non-unit fractions. This work develops students' understanding that denominators help us understand the size of the equal parts we need to make one whole.

Students engage in Mathematical Practice 6 (attend to precision) as they iterate unit fractions on number lines and tape diagrams.

Key vocabulary:

  • denominator
  • fraction
  • numerator
  • unit fraction