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Checking Subtractions (2)

In this worksheet, students must use additions to check subtractions. Three-digit numbers are used.

'Checking Subtractions (2)' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:  

Worksheet Overview

From any addition fact such as

135 + 423 = 558

 

we can work out two subtraction facts.

 

Here we get

558 - 135 = 423

and

558 - 423 = 135

 

This is handy because we can use additions to check subtractions.

 

 

Example 1

Anna says that

 

433 - 115 =     318     

 

Use addition to check if she is right or wrong.

 

Answer

318 + 115 = 433

 

So Anna is right.

 

 

Example 2

Ben says that

 

514 - 325 =     219     

 

Use addition to check if he is right or wrong.

 

Answer

219 + 325 = 544 not 514

 

So Ben is wrong.

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