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Percentage of a Number

Formulas, mental math tricks, and a trainer to practice calculating percentages.

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Percentages — Key Formulas

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Frequently Asked Questions

How do you calculate 10% of a number?

Divide the number by 10. For example, 10% of 80 = 80÷10 = 8. Quick trick: move the decimal point one place to the left.

How do you find 25% of a number?

Divide the number by 4. For example, 25% of 60 = 60÷4 = 15. Or: find 50% (÷2) and then divide by 2 again.

How do you calculate a percentage in your head?

Remember: 10%=÷10, 20%=÷5, 25%=÷4, 50%=÷2. For 15%: find 10%+5%. For 30%: find 10%×3.