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A preview
What a question looks like
Example questionWhat is 20% of 255?
Answer: 51
- Write 20% as 20/100.
- 255 × 20/100 = 51.
Use this practice well
Translate the percent to a fraction over 100 or a decimal before calculating. Ask what the whole represents; this prevents applying the rate to the wrong quantity.
What this develops
Create percent questions involving proportions and amounts.
A mistake to watch for
Treating 15% as 15 rather than 0.15 makes an answer a hundred times too large.
Ways to use it
- Introduce percent-of-a-number calculations.
- Review discounts without a sales context.
- Check reasonableness against 0%, 50%, and 100%.
Scope and limits
This page is numeric percent practice, not a personal finance course.
Read our generation and answer-checking method.