The price of a game rose from $50 to $65. What is the percent increase?
A bike helmet drops from $80 to $68. What is the percent decrease?
Which single multiplier gives the new amount after a \(35\%\) decrease?
A $45 pair of shorts is \(20\%\) off. What is the sale price?
After a \(25\%\) increase, a value is 75. What was the original value?
Sofia measures a rope as 9.5 feet. The actual length is 10 feet. What is the percent error?
A price of $100 rises by \(20\%\) and then falls by \(20\%\). How does the final price compare with $100?
A skate park pass falls from $60 to $48. What percent off is that?
Plant A grew from 20 to 25 inches. Plant B grew from 50 to 60 inches. Which grew by the greater percent?
A $25.00 purchase has \(8\%\) sales tax. What is the total?
🎉 Quiz complete!
Remember:
- Percent change \(=\frac{\text{new}-\text{original}}{\text{original}}\times 100\%\); always divide by the original.
- A \(p\%\) increase multiplies by \(1+\frac{p}{100}\); a \(p\%\) decrease multiplies by \(1-\frac{p}{100}\).
- To find the original amount, divide the new amount by the multiplier.
- Percent error \(=\frac{|\text{measured}-\text{actual}|}{\text{actual}}\times 100\%\) and is never negative.
- A percent increase can be larger than \(100\%\); a percent decrease can never exceed \(100\%\).
See every chapter on the Grade 7 math page.