Comprehensive & curriculum aligned

In this worksheet, students will work out the missing number in addition sums.

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Difficulty level:

Worksheet Overview

In this activity, we will be working out the missing numbers.

Example 1

26 + ? = 50

Here, it is easy to work out the inverse.

50 - 26 = 24

Example 2

-26 + ? = 50

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

50 - -26 means 50 + 26 because two negative signs next to each other make a positive.

50 + 26 = 76

Example 3

0.81 + ? = 1

Here it is easy to work out the inverse - don't be put off by the decimal!

1 - 0.81 = 1.00 - 0.81 = 0.19

It may help to think of 100 - 81 = 19.

Shall we have a go at some questions now?

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