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Find the Number: Use the inverse operation

In this worksheet, students find the missing number in a sum by using addition and subtraction.

'Find the Number: Use the inverse operation' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Correct Methods to Problem Solve

Difficulty level:  

Worksheet Overview

In this worksheet you must find the missing number in a sum.

 

Example

Find the number that makes the sum correct.

332 + __ = 900

 

Answer

The opposite (inverse) of adding is subtracting.

So we work out 900 - 332 = 568

 

Here is a simpler example:

400 + ___ = 600

The inverse operation is

600 - 400 = 200

The answer is 200

 

 

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