Lesson Plan: Estimating Sums of Three-Digit Numbers: Rounding | Nagwa Lesson Plan: Estimating Sums of Three-Digit Numbers: Rounding | Nagwa

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

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use different strategies to estimate the sum of two three-digit numbers.

Objectives

Students will be able to

  • identify the digit with the highest place value in a three-digit number,
  • round three-digit addends to the highest place value,
  • estimate the sum of three-digit numbers by rounding to the nearest ten or hundred,
  • estimate the sum of three-digit numbers by rounding to the highest place value,
  • compare the accuracy of different estimates.

Prerequisites

Students should already be familiar with

  • the place values of three-digit numbers,
  • using column addition to find the sum of two-digit or three-digit numbers,
  • rounding three-digit numbers to the nearest ten or hundred.

Exclusions

Students will not cover

  • estimating the sum of four-digit numbers.

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