Percent Off Quiz
10 questions. No calculator needed. How fast can you solve them?
Question 1 of 10
Score: 0/0
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Why Practice Percent-Off Problems?
Percentage calculations appear in every standardized math test from grade 6 through college entrance exams. They are also the most commonly used math skill in daily adult life — shopping, tipping, taxes, and salary negotiations all require quick percentage thinking.
Key Formulas to Remember
| Problem Type | Formula | Example |
|---|---|---|
| Simple discount | Price × (1 − %/100) | 10% off $50 = $45 |
| Find the savings | Price × %/100 | 10% of $50 = $5 |
| Stacked discounts | Price × (1−A%) × (1−B%) | 10%+20% off $100 = $72 |
| Discount + tax | Discounted × (1 + tax%) | $45 + 8% tax = $48.60 |
| Find original price | Sale ÷ (1 − %/100) | $45 was 10% off → $50 |
Tips for Students
10% shortcut: Just move the decimal point one place left. 10% of $45.00 = $4.50.
5% shortcut: Find 10% first, then halve it. 5% of $80 = $8 ÷ 2 = $4.
25% shortcut: Divide by 4. 25% of $80 = $20.
Any % shortcut: Break it into 10% chunks. 30% = three × 10%. 15% = 10% + 5%.
Frequently Asked Questions
The quiz covers concepts typically taught in grades 6-8 (ages 11-14), but is useful for anyone wanting to practice mental math with percentages.
Absolutely! Teachers are welcome to share this page with students. The quiz generates the same 10 questions each time, making it easy to track improvement.
Practice the shortcut methods: 10% = move decimal, 5% = half of 10%, 25% = divide by 4, 1% = move decimal twice. Combine these building blocks for any percentage.
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