Percent of Change and Error

Last month, the online price of a powered ride-on car was $250. This month, the online price is $330. What is the percent of increase for the price of the car?

• 20%

• 25%

• 30%

• 32%

At end of the first half of a football game, Nathan had carried the ball for 50.5 yards. By the end of the game, he carried the ball for a total of 75 yards. Find the percent of increase in the number of yards he carried. Round to the nearest whole tenth if necessary.

• 25%

• 48.5%

• 32.5%

• 49.5%

A music video website received 5,000 comments on a new song they released. The next day, the artist performed the song on television and an additional 1,500 comments were made on the website. What was the percent of increase?

• 20%

• 25%

• 30%

• 35%

When Ricardo was 9 years old, he was 56 inches tall. Ricardo is now 12 years old and he is 62 inches tall. Find the percent of increase in Ricardo’s height to the nearest tenth.

• 10.7%

• 9.3%

• 8.5%

• 7.1%

At a garage sale, Petra priced her scooter for $15.50. She ended up selling it for $10.75. Find the percent of decrease in the price of the scooter. Round to the nearest tenth if necessary.

• 30.6%

• 25.5%

• 20.5%

• 15.2%

At the beginning of a baking session, there were 2.26 kilograms of flour in the bag. By the end of the baking session, there was 0.98 kilogram of flour in the bag. What is the percent of decrease, rounded to the nearest tenth, for the amount of flour?

• 56.6%

• 57.1%

• 58.4%

• 59.2%

Doug estimates that his soccer team will win 7 games this year. The team actually wins 10 games. What is the percent error of Doug’s estimate? Round the answer to the nearest tenth percent, if necessary.

• 30%

• 42.9%

• 50%

• 70%

Oliver estimates the weight of his cat to be 16 pounds. The actual weight of his cat is 14.25 pounds. What is the percent error of Oliver’s estimate rounded to the nearest tenth of a percent?

• 12.3%

• 10.9%

• 11.5%

• 13.2%

A cyclist estimates that he will bike 80 miles this week. He actually bikes 75.5 miles. What is the percent error of the cyclist’s estimate rounded to the nearest hundredth of a percent?

• 5.63%

• 5.50%

• 5.75%

• 6.00%

The number of students in a class increases from 20 to 25. What is the percent change of the class size?

• 20%

• 25%

• 5%

• 10%