AnswersGrade 7 MathematicsProportional Reasoning with Percents

Practice Test Answers

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Antoine and Tess have a disagreement over how to compute a 15 percent gratuity on 46 point 0 0 dollars Tess says, “It is easy to find 10 percent of 46 by moving the decimal point one place to the left to get 4 point 6 0 dollars Do that twice. Then add the two amounts to get 4 point 6 0 dollars plus 4 point 6 0 dollars is equal to 9 point 2 0 dollars for the 15 percent gratuity.” How should Antoine respond to Tess’s method?

A
“Tess, you should use a table with 5 percent segments to find the gratuity. Each 5 percent segment has a value of 9 point 2 0 dollars , so that is the 15 percent gratuity.”
B
“Tess, the best way to find 15 percent of 46 point 0 0 dollars is to multiply 1 over 15 by 46 point 0 0 dollars to get 3 point 0 7 dollars , which is the 15 percent gratuity.”
C
“Tess, you found 20 percent of the number because you added 10 percent and 10 percent . You need to add 10 percent to 1 half of 10 percent . Add 4 point 6 0 dollars and 2 point 3 0 dollars to get 6 point 9 0 dollars , which is the 15 percent gratuity.”
D
“Tess, the best way to find 15 percent of 46 point 0 0 dollars is to multiply 0 point 0 1 5 and 46 point 0 0 to get 0 point 6 9 dollars , which is the 15 percent gratuity.”
3

The new number, 550 , is 200 more than the original number. What is the approximate percent change?

A
The percent change is approximately 150 percent .
B
The percent change is approximately 55 percent .
C
The percent change is approximately 33 percent .
D
The percent change is approximately 175 percent .
6

Pedro predicted that he would sell 128 novels. He actually sold 150 novels. What are the values of A and b in the given table? Percent Error Item Approximate value Exact value Error Absolute error Ratio Percent error Novels 128 150 A b

A
A is equal to 22 over 150 ; b is equal to 14 point 7 percent
B
A is equal to 22 over 128 ; b is equal to 17 point 2 percent
C
A is equal to negative 22 over 128 ; b is equal to negative 17 point 2 percent
D
A is equal to negative 22 over 150 ; b is equal to negative 14 point 7 percent
10

A count went from 605 to 203 What was the approximate percent decrease? Round the numbers to find an estimate of the percent decrease.

A
The percent decrease was approximately 25 percent .
B
The percent decrease was approximately 66 percent .
C
The percent decrease was approximately 33 percent .
D
The percent decrease was approximately 50 percent .
12

A store is marking down the price of a television 25 percent from the original price of 250 dollars Which expression can be used to find the marked down price?

A
250 dollars minus 0 point 2 5 times 250
B
250 dollars plus 25 times 250
C
250 dollars plus 0 point 2 5 times 250
D
250 dollars minus 25 times 250
16

Which interest rate is missing from Renee’s table?

A
0 point 0 5 percent
B
50 percent
C
0 point 5 percent
D
5 percent

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