What is 10% of 100?
Calculate Any Percentage
Step-by-Step Solution
- Write 10% as a decimal: 10 ÷ 100 = 0.1
- Multiply: 0.1 × 100 = 10
Formula: Percentage × Amount ÷ 100 = Result
How Percentages Work
The word "percent" means "per hundred." So 10% means 10 out of every 100. The formula is: Result = (Percentage / 100) × Amount. For 10% of 100: (10 / 100) × 100 = 10.
Real-World Examples
Shopping: a 10% discount on a $100 item saves you $10. Tips: 10% tip on a $100 bill is $10. Finance: 10% annual return on a $100 investment earns $10 per year. Tax: 10% tax rate on $100 income means $10 in taxes.
Mental Math Tip
To calculate 10% quickly: find 10% first (10), then adjust. 5% is half of 10%. 20% is double 10%. 1% is 10% divided by 10. Combine these building blocks for any percentage without a calculator.
Common Mistakes
Successive discounts do not add up. A 10% discount followed by another 10% discount is NOT 20% off. The second discount applies to the already-reduced price. Also, percentage increase and percentage points are different: going from 10% to 20% is a 10 percentage point increase but a 100% relative increase.