What is 45% of 40?

45% of 40 = 18

How to work it out

1. Convert the percentage to a decimal: 45 ÷ 100 = 0.45
2. Multiply by the number: 0.45 × 40 = 18

40 increased by 45% is 58; decreased by 45% it is 22 (useful for discounts).

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