Lesson Plan: Subtracting Fractions with Unlike Denominators Mathematics • 5th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to subtract two proper fractions with different denominators by finding a common denominator.

Objectives

Students will be able to

  • represent subtraction of fractions using models including bar models,
  • subtract unit fractions with different denominators,
  • subtract proper fractions with different denominators.

Prerequisites

Students should already be familiar with

  • finding common denominators of fractions using multiplication and division up to 12×12.

Exclusions

Students will not cover

  • finding least common multiples using prime factors.

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