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SAT Math: Find a percent of a number
30+ practice questions in Praczo
What you need to know
The concept, explained
- 1
To find p% of N, compute (p/100) · N. For example, 15% of 200 = 0.15 · 200 = 30.
- 2
Convert the percent to a decimal first: 8% → 0.08, 120% → 1.20.
- 3
For tips and discounts, percent of the original amount tells you how much to add (tip) or subtract (discount).
- 4
For multi-step problems, apply percents one at a time — do not add percents unless they are of the same base.
Common mistakes
- ✗ Using the percent as a whole number (e.g., multiplying by 15 instead of 0.15).
- ✗ Confusing a percent of a number with percent change between two numbers.
Try a sample question
SAT-style practice
A jacket costs $80. The store offers a 25% discount. What is the discount amount?
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