Lesson Plan: Subtracting Mixed Numbers with Like Denominators Mathematics • 4th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use different strategies to subtract two mixed numbers with the same denominator.


Students will be able to

  • model subtraction of mixed numbers with bar models and number lines,
  • break apart mixed numbers and subtract the whole number parts and fraction parts separately,
  • rename a mixed number to subtract when necessary,
  • subtract mixed numbers by writing them as improper fractions,
  • choose strategies to subtract mixed numbers.


Students should already be familiar with

  • converting between mixed numbers and improper fractions,
  • simplifying fractions.


Students will not cover

  • subtracting mixed numbers with unlike denominators.

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