# Find the Missing Number in a Calculation

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

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Solve Add/Subtract Problems to 1000

Difficulty level:

#### Worksheet Overview

In this activity, we will find the missing number in a calculation.

Example

Find the missing number in the sum.

134 + ___ + 22 = 160

Step 1:   Add together 134 + 22 = 156.

Step 2:   Work out what you need to reach 160 by calculating 160 - 156 = 4

So,

134 +  4  + 22 = 160

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