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# Calculating a percentage of an amount
- URL: https://www.esheets.io/calculating-a-percentage-of-an-amount/
- Published: 2025-04-06T14:32:47.000Z
- Updated: 2026-06-21T16:35:22.000Z
- Author: Richard Linnington
- Tags: Maths, Number

Finding a percentage of an amount is a skill you'll use in loads of real-life situations—like working out how much discount you’re getting in a sale, calculating tips at a restaurant, or figuring out how much battery life you’ve got left. It’s all about taking a chunk of something and seeing what part of the whole it represents. [Jump to the questions](#practise-now)

## Practise now

Worksheet preview and key skills 

### Worksheet preview

Practise calculating a percentage of an amount with this self-marking maths worksheet.

The interactive worksheet below generates questions, gives instant feedback, and lets students record their score.

#### What you’ll practise

- Identifying the percentage required.
- Converting the percentage to a decimal or fraction.
- Multiplying by the amount.
- Checking the answer is the correct part of the whole.

Use the interactive worksheet below, or read the [Topic guide](#topic-guide) for the method and worked example.

## Topic guide

### What this worksheet practises

This worksheet practises calculating a percentage of a given amount without using a calculator.

### Key method

To find a percentage of an amount without a calculator, build up the required percentage using simple building blocks like 10%, 5%, and 1%.

- To find **10%**, divide the amount by 10.
- To find **5%**, find 10% and halve it.
- To find **1%**, divide the amount by 100.

Once you have these building blocks, you can add or multiply them to find any other percentage.

### Worked example

**Calculate 15% of £80.**

Step 1: Find 10%.

£80 ÷ 10 = £8

Step 2: Find 5%.

Halve the 10% value: £8 ÷ 2 = £4

Step 3: Add the 10% and 5% values together to make 15%.

£8 + £4 = £12

Therefore, 15% of £80 is £12.

### Useful tips

If you need to find a multiple of 10%, such as 30%, simply find 10% and multiply your answer by 3\. You can use similar logic for numbers ending in 5 or 1, assembling the pieces until you reach the target percentage.

### How to check your answer

You can verify your logic by checking if the answer feels proportional. If you are asked for 45%, your answer should be slightly less than half of the original amount. If it is larger, you know a mistake has been made in the calculation.