Percentage of an amount
You learn to work out a percentage of a number, and what something costs after a discount.
How to work it out
- Write down the whole number: that is 100%.
- Divide by 2 for 50%, by 4 for 25% and by 10 for 10%.
- Build the requested percentage from these parts: 75% is 50% + 25%, 5% is half of 10%.
- For a discount, subtract that amount from the price.
100
10
30
80
8
24
25% of 40
- Write 40 as 100%.
- Divide by 4 for 25%: 40 ÷ 4 = 10.
- It is 10.
100
25
40
10
More examples
75% of 80
- First write down what you know: 80 is 100%.
- Divide by 4 for 25%: 80 ÷ 4 = 20.
- Multiply by 3 for 75%: 3 × 20 = 60.
- It is 60.
100
25
75
80
20
60
£240 with a 15% discount
- First write down what you know: £240 is 100%.
- Divide by 20 for 5%: 240 ÷ 20 = 12.
- Multiply by 3 for 15%: 3 × 12 = 36.
- That is the discount.
- Take it away: 240 − 36 = 204.
- It costs £204.
100
5
15
240
12
36