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Use Addition or Subtraction to Find the Missing Number

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

Worksheet Overview

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



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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