  # Use Addition to Check Subtractions

In this worksheet, students will use additions to check subtractions. Simple four-digit numbers are used. Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate Calculations and Check Answers

Difficulty level:   #### Worksheet Overview

From any addition fact such as

1,300 + 5,200 = 6,500

we can work out two subtraction facts.

Here we get:

6,500 - 1,300 = 5,200

and

6,500 - 5,200 = 1,300

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

Example 1

Ahmed says that

2,800 - 1,100 =
 1,700

Use addition to check if he is right or wrong.

1,700 + 1,100 = 2,800

So Ahmed is right. Example 2

Bill says that

6,500 - 3,700 =
 3,200

Use addition to check if he is right or wrong.

3,200 + 3,700 = 6,900 not 6,500

So Bill is wrong. Let's have a go at some questions on this now.

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