Percentage of a quantity

Per cent means 'out of 100', so a percentage is a share of an amount. To find 25% of 80, turn the percent into hundredths and multiply: 25 ÷ 100 × 80 = 20. A quick way is to find 1% first (divide by 100) and then multiply by the percent, or use friendly benchmarks — 10% is a tenth, 25% is a quarter, 50% is a half. The answer is always a part of the original amount, so it can never be bigger than what you started with.