  # Addition and Subtracting: Checking Subtractions (2)

In this worksheet, students must use additions to check subtractions. 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

1462 + 3763 = 5225

we can work out two subtraction facts.

Here we get

5225 - 1462 = 3763

and

5225 - 3763 = 1462

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

Example 1

Caleb says that

5681 - 1724 =
 3957

Use addition to check if he is right or wrong. So 3957 + 1724 = 5681

Caleb is right.

Example 2

Dahlia says that

6286 - 2457 =
 4829

Use addition to check if she is right or wrong. So 4829 + 2457 = 7286 not 6286

Dahlia is wrong.

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