Everyday
What is 40% of 30?
40% of 30 = 12
The answer, how it is worked out, and the percentages people look up next.
Working: 40 ÷ 100 × 30 = 12
Common questions
How do you work out 40% of 30?
Divide 40 by 100 to get the decimal, then multiply by 30. That gives 12.
What is the formula for percentages?
Percent of a number = (percent ÷ 100) × number. The same formula works for any pair of values.
How do I do this without a calculator?
Find 10% by moving the decimal one place left, then scale it. 10% of 30 is 3, so you can add or subtract tenths and halves to reach most percentages quickly.