Copy of Percent Change Practice (5/28/2026)

If you do not have a calculator - use https://www.desmos.com/scientific

Recommendation - use paper and pencil, record the above formula, work each question out on paper, and use a calculator to help you with the calculations.

We will do these five questions as a class.

Pay attention to formula and how it is used in the calculator.

a.) A plant's height increased from 30 cm to 45 cm. What is the percent change in height?

b.) A student's test score improved from 75 to 90. Calculate the percent change in the test score.

c.) The price of a shirt decreased from $40 to $30. What is the percent change in price?

d.) A company's revenue rose from $1,200,000 to $1,500,000. What is the percent change in revenue?

e.) A car's fuel efficiency improved from 20 miles per gallon to 25 miles per gallon. What is the percent change in fuel efficiency?

You will do the following five questions independently.

Use the percent change formula and your calculator to calculate the percent change for each of these.

a.) The population of a town decreased from 10,000 to 8,500. Calculate the percent change in population.

b.) A student's GPA increased from 3.0 to 3.5. What is the percent change in GPA?

c.) An athlete's race time improved from 12.0 seconds to 10.5 seconds. What is the percent change in race time?

d.) A book's price increased from $15 to $18. What is the percent change in the price of the book?

e.) A computer's memory capacity increased from 256 GB to 512 GB. Calculate the percent change in memory capacity.