Lesson Plan: Adding and Subtracting Decimals Mentally Mathematics • 5th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use mental strategies to add and subtract decimal numbers.


Students will be able to

  • add decimals by making a whole,
  • subtract decimals by counting up to a whole and then adjusting,
  • using the compensation method to add or subtract decimals.


Students should already be familiar with

  • reading and writing decimals,
  • number bonds to 10 and 100.


Students will not cover

  • using models to add and subtract decimals,
  • written strategies for adding and subtracting decimals.

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