HSPT Quantitative : How to manipulate numbers

Study concepts, example questions & explanations for HSPT Quantitative

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Example Questions

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Example Question #1 :How To Manipulate Numbers

What number is the square of 4 divided by 2?

Possible Answers:

\dpi{100} 8

\dpi{100} 1

\dpi{100} 4

\dpi{100} 16

Correct answer:

\dpi{100} 8

Explanation:

First, square 4.

\dpi{100} 4^{2}=16

Then divide the answer by two.

\dpi{100} \frac{16}{2}=8

Example Question #2 :How To Manipulate Numbers

What number is the cube of 4 multiplied by 2?

Possible Answers:

\dpi{100} 64

\dpi{100} 128

\dpi{100} 24

\dpi{100} 32

Correct answer:

\dpi{100} 128

Explanation:

First, cube 4.

\dpi{100} 4^{3}=64

Multiply that answer by 2.

\dpi{100} 2\times 64=128

Example Question #2 :Number Manipulation*

What number divided by 5 is\dpi{100} \frac{1}{8}of 40?

Possible Answers:

\dpi{100} 5

\dpi{100} 40

\dpi{100} 25

\dpi{100} 20

Correct answer:

\dpi{100} 25

Explanation:

Set up an equation that fits the information:

\dpi{100} \frac{x}{5}=\frac{1}{8}\cdot 40

\dpi{100} \frac{x}{5}=5

\dpi{100} 5\cdot \frac{x}{5}=5\cdot 5

\dpi{100} x=25

Example Question #3 :How To Manipulate Numbers

What number is 4 times\dpi{100} \frac{1}{8}of 80?

Possible Answers:

\dpi{100} 3200

\dpi{100} 20

\dpi{100} 40

\dpi{100} 32

Correct answer:

\dpi{100} 40

Explanation:

Set up an equation using the information provided, and then solve.

\dpi{100} x=4\cdot (\frac{1}{8}\cdot 80)

\dpi{100} x=4\cdot 10

\dpi{100} x=40

Example Question #3 :Number Manipulation*

What number divided byispercent of?

Possible Answers:

Correct answer:

Explanation:

Work backwards to solve this problem. First,percent ofis, because.

Now, multiply this byto reverse the division.

, so the answer is 180.

Example Question #4 :Number Manipulation*

ispercent of what number?

Possible Answers:

Correct answer:

Explanation:

Usingto represent the unknown number, we know that. Using algebraic manipulation, divide both sides byto find.

Example Question #1 :Number Manipulation*

What number isofless than?

Possible Answers:

Correct answer:

Explanation:

Work backwards to solve this problem. First,less thanis:

Then,ofis:

Example Question #1 :How To Manipulate Numbers

What number ispercent of the difference betweenand?

Possible Answers:

Correct answer:

Explanation:

Work backwards to solve this problem. First, the difference betweenandis:

Then,percent of that is:

Example Question #1 :Number Manipulation*

What number ispercent of?

Possible Answers:

Correct answer:

Explanation:

Multiplybyto findpercent:

Example Question #3 :How To Manipulate Numbers

What is the average ofand?

Possible Answers:

Correct answer:

Explanation:

The first step is to calculate the squares:

第二,发现平均通过寻找和di的数目viding by the number of numbers:

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