Last updated: October 22, 2026 · Written by the Math Made Easy math teachers
Looking for a percent change quiz? Then this Grade 7 quiz on Calculating Percent Change and Percent Error asks 10 multiple-choice questions with instant feedback. These ten questions check percent increase and decrease, finding an original amount, and percent error. Choose one answer, then read the explanation, which names the mistake behind each wrong option, such as dividing by the wrong value.
Standards: 7.RP.A.3 · Level: Grade 7
What this Calculating Percent Change and Percent Error quiz checks
- Percent change = (new − old) ÷ old × 100%.
- Always divide by the starting amount, even for a decrease.
- To find the original amount, divide the new amount by 1 + r (increase) or 1 − r (decrease).
- Percent error = |measured − actual| ÷ actual × 100%.
- An increase and a decrease of the same percent do not cancel.
The 10 questions of the quiz
- A price rises from $20 to $26. What is the percent increase?
- A town’s population falls from 500 to 420. What is the percent decrease?
- What is the percent decrease from 80 to 60?
- After a 20% increase, a concert ticket costs $84. What was the original price?
- In the percent error formula, the absolute error is divided by
- A student measures 46 cm; the actual length is 50 cm. What is the percent error?
- What is the percent error of the measured value?
- A salary of $800 gets a 5% raise, then a 5% cut. What is the final salary?
- A rate increases from 40 to 90. What is the percent increase?
- After a 25% discount, a lamp costs $45. What was the original price?
After the quiz
Missed a question? Reread the Calculating Percent Change and Percent Error lesson, then take the quiz again. Next, solve the Grade 7 worksheet on Calculating Percent Change and Percent Error, one star first, then two and three stars. Finally, take the chapter test under real conditions, without notes and with a timer.
Mis à jour le