Percentage of an amount
- Find 10% or 1%.
- Scale to the required percentage.
- Check the size of the answer.
Answer: 15% of 200 = 30
🔢 Number
Percentage of amounts
Learn percentage of amounts with a GCSE-style explanation, help guide, worked example, practice question and flashcards.
Global XP
Level 10 / 100 XP
1. Explanation
Key idea
- Percentage of amounts is part of percentages and appears often in KS3–GCSE maths.
- Find a percentage of an amount by converting to a decimal or building from 10% and 1%.
- Use the worked model, help guide, interactive question and flashcards to practise percentage of amounts until the steps feel automatic.
Real-life examples
- Shopping, sport, travel, science, design and everyday decisions all use this skill.
2. Visual
Percentage of amounts learning map
Understand the key idea → follow the help guide → practise a question → check your method → build speed with flashcards.
3. Help guide
How to tackle Percentage of amounts
- Learn the rule: Find a percentage of an amount by converting to a decimal or building from 10% and 1%.
- Worked model: Find 10% or 1%. Scale to the required percentage. Check the size of the answer.
- Try the interactive question without looking at the answer first.
- Use the flashcards to test the rule, the method and a common check.
4. Worked examples
Step-by-step working
5. Interactive questions
Try it yourself
Find 30% of 90.
6. Flashcards
Master quick recall
Flip each card, then choose whether you know it or need more practice.
0 mastered
FrontRule for Percentage of amounts
BackFind a percentage of an amount by converting to a decimal or building from 10% and 1%.
FrontExample answer: Find 30% of 90.
Back10% is 9, so 30% is 3 × 9 = 27.
FrontCommon check for Percentage of amounts
BackCheck units/notation, compare with an estimate, and make sure the answer matches the question.
7. Finish
Complete this topic
When you have read the examples, tried the question and reviewed flashcards, claim your topic completion XP.