Lesson Plan: Subtraction of Rational Numbers Mathematics • 7th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to subtract rational numbers, including fractions, decimals, and percentages.


Students will be able to

  • use a number line to subtract rational numbers,
  • subtract rational numbers as fractions (including mixed numbers) with unlike denominators by using the LCM of the denominators,
  • subtract rational numbers in different forms,
  • convert between fractions, decimals, and percentages in order to subtract rational numbers of different forms.


Students should already be familiar with

  • the definition of a rational number,
  • simplifying fractions,
  • converting between fractions, decimals, and percentages,
  • addition of rational numbers,
  • addition and subtraction of negative numbers.


Students will not cover

  • multiplication and division of rational numbers,
  • evaluating algebraic expressions.

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