  # Work Out the Missing Number in a Variety of Calculations

In this worksheet, students will work out the missing number in a variety of calculations. Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Relationships Between Operations

Difficulty level:   #### Worksheet Overview

In this activity, we will work out missing numbers in calculations.

Example 1

Find the missing number.

26 + ? = 50

Here, it is easy to work out the inverse.

50 - 26 = 24

Example 2

Find the missing number.

-26 + ? = 50

Here, we use the inverse again, but be careful about the negative sign.

Two negatives next to each other means a positive.

50 - -26 = 50 + 26 = 76

In this activity, we will be using inverse operations to find the missing numbers. ### What is EdPlace?

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