Percent Change and Error Review

Multiple Choice

A paper mill cuts poster boards that are 36 in. long. A poster board is acceptable if the percent error of its length is less than 1.5%. What are all the acceptable lengths of a poster board? ​

• greater than 35.46 and less than 36.54
• less than 35.5 and greater than 36.5

• greater than 35.6 and less than 36.4

​Complete these questions in your book starting on Page 465.

MAKE SURE TO SHOW ALL WORK!

MISS STONE WILL BE CHECKING FOR A GRADE.

Fill in the Blanks

The boiling point of water is 212  F at sea level. Andres lives at an elevation of 7,500 ft. At his home, Andres finds that water boils at 198  F. What is the percent decrease in the boiling point of water from sea level to 7,500 ft? Give your answer to the nearest  tenth of a percent.

Multiple Choice

Each summer, a school offers a trip to Washington, D.C. Last summer, 80 students signed up for the trip. This summer, 94 students signed up for the trip. To the nearest percent, what is the percent change in the number of students who signed up for the trip?

• 2%

• 14%

• 15%

• 18%

Open Ended

Each summer, a school offers a trip to Washington, D.C. Last summer, 80 students signed up for the trip. This summer, 94 students signed up for the trip. To the nearest percent, what is the percent change in the number of students who signed up for the trip?

How might someone get 14% as an answer?

Multiple Choice

Elena uses jars to store her craft supplies. She estimates that each jar will fit 1,000 buttons or 50 large beads. Each jar actually fits 677 buttons or 22 large beads. Does Elena’s estimate for the number of buttons or her estimate for the number of large beads have less percent error? To the nearest percent, how much less?

• Buttons by 79%

• Beads by 21%

• Beads by 80%

• Buttons by 21%

Multiple Select

Kevin’s weekly salary is $865. He receives a 25% raise. How can Kevin find his new weekly salary? Select all the correct answers

• divide 865 by 0.25

• divide 865 by 1.25

• multiply 865 by 0.25

• multiply 865 by 1.25

• add 865 and  $$\frac{1}{4}$$   of 865

Categorize

Options (4)

A $12 cost increased to $15

A person's height increases from 52 in. to 61 in.

The temperature falls from 20 to 16.

$$n\ changes\ to\ \frac{3}{4}n$$  

For each of the following situations, is the percent change greater than or equal to 20% and less than 30%? Sort into Yes or No for each situation.

Yes

No

Dropdown

Doubling an amount is the same as a percent increase of ​

Select answer

. The result of increasing 5 by 200% is

Select answer

.

Multiple Choice

Most days, Mr. Romano sells umbrellas for $8 each. On rainy days, he increases the price by 75%. How much does he charge, in dollars, for an umbrella on rainy days?

• $10
• $12
• $16
• $14