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

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In this lesson, we will learn how to use different strategies to subtract numbers with up to four digits efficiently.

Lesson Plan

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.

Q1:

Natalie wants to calculate . She thinks that if she changes the subtraction to , it will be easier to calculate.

Using Natalie’s method, what is ?

Q2:

Chloe is calculating .

She knows that it is easy to subtract 10s, so she solves the calculation in two steps: and .

Following Chloe’s method, what is ?

Q3:

Calculate by subtracting hundreds, tens, and ones.