Lesson Plan: Mental Subtraction of Numbers up to 10 000 Mathematics • 4th Grade

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This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to subtract two numbers with up to four digits mentally by apply a variety of strategies.

Objectives

Students will be able to

subtract three- or four-digit numbers from four-digit numbers mentally by counting back,
subtract three- or four-digit numbers from four-digit numbers mentally by breaking the subtrahend apart,
subtract three- or four-digit numbers from four-digit numbers mentally using compensation,
select the most effective mental strategy to subtract a three- or four-digit number from a four-digit number.

Prerequisites

Students should already be familiar with

partitioning three- and four-digit numbers,
using place value models to represent three- and four-digit numbers.

Exclusions

Students will not cover

subtracting numbers with more than four digits,
column subtraction.