Lesson Plan: Mental Subtraction of Numbers up to 10 000 | Nagwa Lesson Plan: Mental Subtraction of Numbers up to 10 000 | Nagwa

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

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.

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