Use Addition or Subtraction to Find the Missing Number

In this worksheet, students will use addition or subtraction to work out the missing number in a problem.

Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Understand Relationship Between Addition and Subtraction

Difficulty level:

Worksheet Overview

This activity is about finding the missing number in adding sums.

Example

Find the value of the missing number.

 25 + = 28

We need to find the difference between 25 and 28.

We can turn this into a subtraction problem and work it out by doing 28 - 25 = 3

Or we can count on from 25.....26, 27, 28 ........ that's 3 numbers.

So, the answer is 3

You can see that there is often more than one way of finding the answer to a maths problem. The important thing is to choose the way that works best for you.

Which of these ways do you find easier?

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