Lesson Plan: Estimating Sums of Two-Digit Numbers: Rounding Mathematics • 3rd Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to estimate the sum of two-digit numbers by rounding to the nearest ten.


Students will be able to

  • round two-digit numbers to the nearest ten,
  • round two two-digit numbers to estimate their sum,
  • apply estimation strategies to problem solving.


Students should already be familiar with

  • adding two-digit numbers on a number line,
  • adding two-digit numbers using the column method.


Students will not cover

  • three-digit numbers.

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