# Solve Percentage Problems Using a Calculator

In this worksheet, students will find a percentage of a given number using a calculator.

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Define, Interpret and Compare Percentages

Difficulty level:

#### Worksheet Overview

This activity is about finding percentages of numbers using a calculator.

Percent means out of a hundred.

We can use this fact to help us convert a percentage to a decimal.

If we are working out 45% of a number, we can do this by considering 45% as 45/100 which means 45 ÷ 100 = 0.45.

So we can work out 45% of 20 by 0.45 x 20.

Try putting this into your calculator, you should get an answer of 9.

Let us look at some more examples.

Example 1

23% of 400

23% means 23/100= 0.23

0.23 x 400 = 92

Example 2

A shirt costs £12.

In a sale, you will save 23% of £12.

How much money do you save?

0.23 x 12 = 2.76.

You save £2.76
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