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PercentagesFree
Finding Percentages of Numbers
Calculate percentages of quantities in real-world scenarios.
25 minGrade 6
Introduction
Finding a percentage of a number is essential for calculating discounts, tips, taxes, and more.
The Formula
To find X% of a number, multiply the number by X/100 (or X × 0.01).
Example
20% of 80 = 80 × 0.20 = 16
Mental Math Shortcuts
For 10%, divide by 10. For 50%, divide by 2. Combine these for other percentages.
Example
15% of 200: 10% is 20, 5% is 10, so 15% is 30
Key Takeaways
- 1Percentage of number = number × (percent ÷ 100)
- 2Use shortcuts: 10% = ÷10, 50% = ÷2
- 3Break complex percentages into simpler ones
Practice Problems
Test your understanding with these questions
1
What is 25% of 80?
2
A shirt costs $40. If it's 10% off, what's the discount?