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Percentage · Beginner

Find 15 percent quickly

Add 10% of the quantity to 5% of it.

01

The fast method

⚡

10% = 8; 5% = 4; total = 12.

How it works

Add 10% of the quantity to 5% of it. 15/100 = 10/100 + 5/100; 5% is half of 10%.

02

Why it works

15/100 = 10/100 + 5/100; 5% is half of 10%.
Use it when

Works for any quantity.

Watch out for

For money, round only at the final step if necessary.

03

Verified examples

Example 1

Find 15% of 80

10% = 8; 5% = 4; total = 12.

12
Example 2

Find 15% of 240

10% = 24; 5% = 12; total = 36.

36
Example 3

Find 15% of 650

10% = 65; 5% = 32.5; total = 97.5.

97.5