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HSPT Math : Percentages

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Example Questions

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Example Question #581 : Concepts

What is $60\%$ of ?

Possible Answers:

Correct answer:

Explanation:

One way to figure out what number is a percentage of a larger number is to convert the percent into a decimal and multiply it by the whole number. Since $60\%$ is equal to 0.60 , multiply this by .

$90 \times 0.60=54$

is your answer.

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Example Question #3 : How To Find The Whole From The Part With Percentage

$64\%$ of what number is 8,000 ?

Possible Answers:

12,800

14,400

15,000

16,000

12,500

Correct answer:

12,500

Explanation:

Taking 64% of a number is the same as multiplying that number by 0.64 . We can find our number, therefore, by dividing 8,000 by 0.64 :

$8,000 \div 0.64 = 12,500$

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Example Question #13 : How To Find The Part From The Whole With Percentage

What is $125\%$ of 125 ?

Possible Answers:

150

156.25

132.5

137.5

100

Correct answer:

156.25

Explanation:

Rewrite $125\%$ as a decimal by writing 125 with a decimal point, then shifting it two spaces left:

$125.0\% = 1.25$

Multiply this by 125 :

$125 \times 1.25 = 156.25$

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Example Question #61 : Percentages

Convert $23.2\%$ into a decimal.

Possible Answers:

0.232

23.2

2.32

0.0232

232

Correct answer:

0.232

Explanation:

In order to convert from a percentage to a decimal, simply remove the percentage and move the decimal place back two spaces or divide by 100.

$23.2\% = \frac{232}{100}= 0.232$

The decimal conversion is: 0.232

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Example Question #1 : Use Proportional Relationships To Solve Multistep Ratio And Percent Problems: Ccss.Math.Content.7.Rp.A.3

What number increased by 25% is equal to 7?

Possible Answers:

$5 \frac{3}{5}$

$4\frac{2}{3}$

$5\frac{1}{4}$

$5\frac{5}{6}$

Correct answer:

$5 \frac{3}{5}$

Explanation:

To increase a number by 25% is to take

$(100 + 25) \% = 125 \%$ of the number, or, equivalently, multiply it by

$\frac{125}{100} = \frac{125 \div 25 }{100 \div 25 } = \frac{5}{4}$ .

Therefore, we divide 7 by $\frac{5}{4}$ :

$7 \div \frac{5}{4} = \frac{7 }{1}\div \frac{5}{4} = \frac{7 }{1}\times \frac{4} {5}= \frac{7\times 4 }{1\times 5} = \frac{28}{5}$

$28 \div 5 = 5 \textup{ R }3$ , so

$\frac{28}{5} = 5 \frac{3}{5}$ .

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Example Question #10 : Use Proportional Relationships To Solve Multistep Ratio And Percent Problems: Ccss.Math.Content.7.Rp.A.3

What number decreased by 25% is equal to 7?

Possible Answers:

$8\frac{2}{5}$

$8\frac{3}{4}$

$9 \frac{1}{3}$

$9 \frac{1}{7}$

Correct answer:

$9 \frac{1}{3}$

Explanation:

To decrease a number by 25% is to take

$(100 - 25) \% = 75 \%$ of the number, or, equivalently, multiply it by

$\frac{75}{100} = \frac{75 \div 25 }{100 \div 25 } = \frac{3}{4}$ .

Therefore, we divide 7 by $\frac{3}{4}$ :

$7 \div \frac{3}{4} = \frac{7 }{1}\div \frac{3}{4} = \frac{7 }{1}\times \frac{4} {3}= \frac{7\times 4 }{1\times 3} = \frac{28}{3}$

$28 \div 3 = 9 \textup{ R }1$ , so

$\frac{28}{3} = 9 \frac{1}{3}$ .

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Example Question #62 : Percentages

What is $3 \frac{1}{2}$ increased by 30%?

Possible Answers:

$4 \frac{1}{5}$

$3 \frac{4}{5}$

$3 \frac{13}{2 0}$

$4 \frac{11}{2 0}$

Correct answer:

$4 \frac{11}{2 0}$

Explanation:

Increasing a number by 30% is equivalent to taking 130% of a number, which in turn is equivalent to multiplying it by

$\frac{130}{100} = \frac{130 \div 10}{100 \div 10} = \frac{13}{10}$ .

$3 \frac{1}{2}$ increased by 30% is the product of $3 \frac{1}{2}$ and $\frac{13}{10}$ :

$3 \frac{1}{2} \times \frac{13}{10}$

$= \frac{3 \times 2 + 1}{2} \times \frac{13}{10}$

$= \frac{7}{2} \times \frac{13}{10}$

$= \frac{7 \times 13}{2 \times 10}$

$= \frac{91}{2 0}$

$91 \div 20 = 4 \textup{ R }11$ , so this quantity is equal to $4 \frac{11}{2 0}$ , the correct answer.

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Example Question #61 : Percentages

What is $3 \frac{1}{2}$ decreased by 40%?

Possible Answers:

$1 \frac{4}{5}$

$2 \frac{1 }{3}$

$2 \frac{1 }{10}$

$3 \frac{3}{10}$

Correct answer:

$2 \frac{1 }{10}$

Explanation:

Decreasing a number by 40% is equivalent to taking 60% of a number, which in turn is equivalent to multiplying it by

$\frac{60}{100} = \frac{60 \div 20}{100 \div 20} = \frac{3}{5}$ .

$3 \frac{1}{2}$ decreased by 40% is the product of $3 \frac{1}{2}$ and $\frac{3}{5}$ :

$3 \frac{1}{2} \times \frac{3}{5}$

$= \frac{3 \times 2 + 1}{2} \times \frac{3}{5}$

$= \frac{7}{2} \times \frac{3}{5}$

$= \frac{7\times 3 }{2\times 5}$

$= \frac{21 }{10}$

$21 \div 10 = 2 \textup{ R }1$ , so the correct response is $2 \frac{1 }{10}$ .

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Example Question #171 : Ratios & Proportional Relationships

6 decreased by what percent is $4\frac{2}{3}$ ?

Select the closest answer.

Possible Answers:

$25 \%$

$30 \%$

$20 \%$

$15 \%$

Correct answer:

$20 \%$

Explanation:

The difference of 6 and $4\frac{2}{3}$ is

$6 - 4\frac{2}{3}$

$= \frac{6 \times 3}{3} - \frac{4 \times 3+ 2}{3}$

$= \frac{18}{3} - \frac{14}{3}$

$= \frac{18-14}{3}$

$= \frac{ 4}{3}$ .

Therefore, 6 is being decreased by $\frac{ 4}{3}$ ; to find out what percent this is of 6, we calculate:

$\frac{\frac{ 4}{3}}{6} \times 100 \%$

$=\left ( \frac{ 4}{3} \div 6 \right ) \times 100 \%$

$=\left ( \frac{ 4}{3} \times \frac{1}{6} \right ) \times 100 \%$

$=\left ( \frac{ 2}{3} \times \frac{1}{3} \right ) \times \frac{100 }{1}\%$

$=\left ( \frac{ 2 \times 1 \times 100}{3 \times 3 \times 1} \right ) \%$

$= \frac{ 2 00}{9} \%$

$2 00 \div 9 = 22 \textup{ R 2}$ , so

$\frac{ 2 00}{9} \% = 22\frac{ 2 }{9} \%$ .

The answer that comes closest among the four choices is 20%.

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Example Question #65 : Percentages

12 increased by what percent is $15\frac{1}{2}$ ?

Select the closest answer.

Possible Answers:

$25 \%$

$30 \%$

$20 \%$

$35 \%$

Correct answer:

$30 \%$

Explanation:

The difference of $15\frac{1}{2}$ and 12 is

$15\frac{1}{2} - 12= 3\frac{1}{2} = \frac{3 \times 2 + 1}{2} = \frac{7}{2}$ .

This represents an increase of

$\frac{\frac{7}{2}}{12} \times 100 \%$

$= \left ( \frac{7}{2} \div 12 \right ) \times 100 \%$

$= \left ( \frac{7}{2} \times \frac{1}{12 } \right ) \times \frac{100 }{1}\%$

$= \left ( \frac{7}{2} \times \frac{1}{3} \right ) \times \frac{25}{1}\%$

$= \frac{175}{6}\%$

$175 \div 6 = 29 \textup{ R }1$ , so this is $29 \frac{1}{6}\%$ .

Tthe response closest to the correct percent is 30%.

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HSPT Math : Percentages

Study concepts, example questions & explanations for HSPT Math

All HSPT Math Resources

Example Questions

Example Question #581 : Concepts

Example Question #3 : How To Find The Whole From The Part With Percentage

Example Question #13 : How To Find The Part From The Whole With Percentage

Example Question #61 : Percentages

Example Question #1 : Use Proportional Relationships To Solve Multistep Ratio And Percent Problems: Ccss.Math.Content.7.Rp.A.3

Example Question #10 : Use Proportional Relationships To Solve Multistep Ratio And Percent Problems: Ccss.Math.Content.7.Rp.A.3

Example Question #62 : Percentages

Example Question #61 : Percentages

Example Question #171 : Ratios & Proportional Relationships

Example Question #65 : Percentages

All HSPT Math Resources

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