Quiz about Percent Change and Error

Question 1

What is the correct Percent Change equation?

Percent of change = _____

Accepted Answer

$$\frac{amount\ of\ change}{original\ amount}$$

Answer

$$\frac{original\ amount}{amount\ of\ change}$$

Answer

$$\frac{percent\ change}{original\ amount}$$

Answer

$$\frac{original\ amount}{percent\ of\ change}$$

Question 2

Percent Error = ______

Accepted Answer

$$\frac{amount\ of\ error}{actual\ amount}$$

Answer

$$\frac{actual\ amount}{amount\ of\ error}$$

Answer

$$\frac{percent\ error}{amount\ of\ error}$$

Answer

$$\frac{actual\ amount}{percent\ error}$$

Question 3

Find the percent of change. Round to the nearest tenth of a percent.

From 53 words to 62 words

Accepted Answer

17.0% increase

Answer

14.5% increase

Answer

16.9% increase

Answer

85% increase

Question 4

Find the percent of change. Round to the nearest tenth of a percent.

From $18.50 to $22.10

Accepted Answer

19.5% increase

Answer

16.3%

Answer

16.2%

Answer

19.6%

Question 5

Find the percent error. Round to the nearest tenth of a percent.

Actual speed: 38 mph

Estimated speed: 35 mph

Accepted Answer

7.9%

Answer

8.1%

Answer

0.79%

Answer

6.8%

Question 6

Find the percent error. Round to the nearest tenth of a percent.

Estimated length: 32 in.

Actual length: 54 in.

Accepted Answer

40.7%

Answer

27.4%

Answer

70.4%

Answer

41.8%

Question 7

Alex buys an antique car for $45,800, restores it, and then sells it for $61,830. Find the percent of change. Is it an increase or a decrease?

Accepted Answer

35% increase

Answer

35% decrease

Answer

65% increase

Answer

65% decrease

Question 8

A sweater is $43. It is on sale for 20% off. What is the final price?

Accepted Answer

$34.40

Answer

$47

Answer

$23

Answer

$8.60

Question 9

A shoe sales associate earned $300 in August. In September she earned 8% more than she did in August. How much did she earn in September?

Accepted Answer

$324

Answer

$308

Answer

$200

Answer

$380

Question 10

An Ipad that costs $500 is on sale for 15% off. Then has a 6% tax. What's the final price?

Accepted Answer

$450.50

Answer

$521

Answer

$491

Answer

$400

Question 11

Dorian goes to his favorite store and sees a pair of sunglasses for $40.00, but he has a coupon for 10% off. After the discount, how much will he pay for his pair of shoes?

Accepted Answer

$36.00

Answer

$4.00

Answer

$3.60

Answer

$44.00

Question 12

The regular price of a scooter is $65.50. It is on sale for $52.40. What is the percent decrease from the regular price to the sale price of the scooter?

Accepted Answer

20%

Answer

35%

Answer

25%

Answer

30%

Question 13

The number of people signed up for a bus trip increased from 32 to 45. What is the percent increase? Round to the nearest percent.

Accepted Answer

41%

Answer

52%

Answer

42%

Answer

45%

Question 14

Mrs. Ciampa had 27 students in her class last year and this year she had 30 students in her math class. What is the percent of change?

Accepted Answer

11%

Answer

24%

Answer

20%

Answer

50%

Question 15

The attendance for the basketball game was estimated to be 15,000 people but 12,500 people attended. What was the percent error?

Accepted Answer

20%

Answer

16.67%

Answer

2500%

Answer

80%

Question 16

The students measured length during a science experiment, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?

Accepted Answer

15.79%

Answer

18.75%

Answer

2.25%

Answer

18%

Question 17

Sam thinks the cost of the book is $50, but actually it's $56. What is Sam's percent of error?

Accepted Answer

10.7%

Answer

6%

Answer

12%

Answer

89%

Question 18

The attendance for the basketball game was estimated to be 15,000 people but 12,500 people attended. What was the percent error?

Accepted Answer

20%

Answer

16.67%

Answer

2500%

Answer

80%

Question 19

Zed went to the store and bought a bag of chips.  He estimated there would be 350 chips in the package, but realized there were only 210 chips in that package.  What was his percent error?

Accepted Answer

67%

Answer

35%

Answer

85%

Answer

92%

Question 20

Jessie estimates the weight of her cat to be 8 pounds.  The actual weight of the cat was 10 pounds.  Find the percent error.

Accepted Answer

20%

Answer

15%

Answer

25%

Answer

30%

Question 21

Bob estimates that there will be 230 people who attend the concert.  There was an actual total of 300 people who attended.  Find the percent error.

Accepted Answer

23%

Answer

33%

Answer

27%

Answer

37%

Question 22

An archaeologist estimated that a fossil was 520 years old. It was actually 500 years old. What was the percent error?

Accepted Answer

4%

Answer

20%

Answer

3.8%

Answer

none of these

Question 23

Griffin was buying a birthday card, he thinks the price is $4.50, but the actual price is $4. What is his percent of error?

Accepted Answer

12.5%

Answer

50%

Answer

0.5%

Answer

0.125%

Question 24

Sam thinks the cost of the book is $50, but actually it's $56. What is Sam's percent of error?

Accepted Answer

10.7%

Answer

6%

Answer

12%

Answer

89%

Question 25

Andrew expected $60 for his birthday, but only got $40. What is the percent of error?

Accepted Answer

50%

Answer

20%

Answer

67%

Answer

150%

Question 26

You guessed that the Chicago Cubs would win 95 games during the regular season. They actually won 103. What was your percent error? Round to the nearest tenth if necessary.

Accepted Answer

7.8%

Answer

7.4%

Answer

0.77%

Answer

0.78%

Question 27

You guess that Lebron James would score 35 points during the game. He actually scored 28. Find your percent error.

Accepted Answer

25%

Answer

30%

Answer

33%

Answer

75%

Question 28

Nick estimated that 60 people would come to eat, but only 45 attended. Whats the % of error?

Accepted Answer

33%

Answer

15%

Answer

25%

Answer

75%

Percent Change and Error

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