Lesson Plan: Converting Lengths: Centimeters and Millimeters Mathematics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to measure lengths using mixed units, convert between lengths using partitioning, and compare lengths given in centimeters and millimeters.


Students will be able to

  • measure lengths in centimeters and millimeters,
  • use the fact that 1 centimeter = 10 millimeters to convert between whole numbers of centimeters and millimeters,
  • use models to partition measurements to convert them,
  • compare lengths in centimeters, millimeters, and mixed measures.


Students should already be familiar with

  • place value of three-digit numbers,
  • comparing three-digit numbers,
  • the fact that 10 millimeters is equal to 1 centimeter.


Students will not cover

  • decimal notation of measures,
  • fractional notation of measures.

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