What is 40% of 30?

40% of 30 = 12

How to work it out

1. Convert the percentage to a decimal: 40 ÷ 100 = 0.4
2. Multiply by the number: 0.4 × 30 = 12

30 increased by 40% is 42; decreased by 40% it is 18 (useful for discounts).

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