# Check Subtractions by Using Addition

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

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.

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.

219 + 325 = 544 not 514

So Ben is wrong.

Shall we try some questions on this now?

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