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Lesson Plan: Ratios

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use a ratio to describe the relationship between two quantities, simplify ratios, and find equivalent ratios.


Students will be able to

  • use ratio to describe the relationship between two quantities, expressed with ratio notation,
  • understand how two quantities expressed as a ratio can be expressed proportionally as a fraction, and vice versa,
  • recognize that a ratio expressed in its simplest form contains only integer values,
  • express a ratio in its simplest form,
  • find an equivalent ratio,
  • convert values in a word problem into a ratio.


Students should already be familiar with

  • modeling sentences that represent a ratio using bar models, or otherwise,
  • simplifying fractions,
  • multiples of numbers.


Students will not cover

  • ratios between three quantities,
  • unit ratio,
  • dividing a quantity in a given ratio.

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