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30
15% of 200 is 30
Other calculations
The formula
Answer = percentage ÷ 100 × the number
How to find a percentage of a number
- 1.Divide the percentage by 100 to turn it into a decimal. 15% becomes 0.15.
- 2.Multiply that decimal by the number.
Worked example
What is 15% of 200?
- 15 ÷ 100 = 0.15
- 0.15 × 200 = 30
15% of 200 is 30.
A shortcut worth knowing
Ten percent of anything is the number with the decimal point moved one place left, so 10% of 240 is 24. Five percent is half of that, and 20% is double. Most everyday percentages can be built from those without a calculator.
Common questions
How do you find a percentage of a number?
Divide the percentage by 100, then multiply by the number. 15% of 200 is 0.15 × 200, which is 30.
How do I work out a tip or a discount?
Both are a percent of a number. A 20% tip on $45 is 0.20 × 45, which is $9. A 30% discount on $80 takes off 0.30 × 80, which is $24, leaving $56.
Can the percentage be more than 100?
Yes. 150% of 80 is 1.5 × 80, which is 120. Anything over 100% gives an answer larger than the number.
Other percentage calculations
How it works
The formula
Answer = percentage ÷ 100 × the number
How to find a percentage of a number
Divide the percentage by 100 to turn it into a decimal. 15% becomes 0.15. Multiply that decimal by the number.
A shortcut worth knowing
Ten percent of anything is the number with the decimal point moved one place left, so 10% of 240 is 24. Five percent is half of that, and 20% is double. Most everyday percentages can be built from those without a calculator.