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What is 10% of 40?
10% of 40 = 4
40 × 10/100 = 4

How to calculate 10% of 40

Multiply 40 by 10 and divide by 100: 40 × 10 ÷ 100 = 4. Equivalent shortcut: 40 × 0.1 = 4.

As a discount

A 10% discount on a 40 purchase saves you 4, so you pay 36. Stacking more discounts? Use the Discount & Tax Calculator — stacked discounts multiply, they don't add.

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