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Use Mental Methods to Solve Subtraction Problems

In this worksheet, students will be asked to use efficient mental methods to subtract mentally. They will use the inverse operation to calculate a missing number.

'Use Mental Methods to Solve Subtraction Problems' worksheet

Key stage:  KS 2

Year:  Year 5 Maths worksheets

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Add/Subtract Mentally

Popular topics:   Subtraction worksheets

Difficulty level:  

Worksheet Overview

In this activity, you will be asked to find the missing number in a subtraction question.

The key to this activity is calculating every answer mentally (in your head) without using pen and paper.


Example 1

In your head, find the missing number


    - 14 = 24



Use the inverse operation (addition) in order to find the answer:

14 + 24 = 38



38 - 14 = 24



Example 2

    - 0.6 = 2



Use the inverse operation in order to find the answer:

2 + 0.6 = 2.6



2.6 - 0.6 = 2



Example 3

34 -  = 11



Use the numbers you have been given to complete a subtraction sum in order to find the missing number:

34 - 11 = 23



34 - 23 = 11


This method will make more sense when you attempt to answer some questions.

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