ISEE Middle Level Math : Numbers and Operations

Study concepts, example questions & explanations for ISEE Middle Level Math

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Example Questions

Example Question #821 : Numbers And Operations

Convert \(\displaystyle 11\%\) to a decimal.

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 1.1\)

\(\displaystyle .011\)

\(\displaystyle .11\)

Correct answer:

\(\displaystyle .11\)

Explanation:

To convert a percentage to a decimal, divide by 100:

\(\displaystyle 11\div 100=.11\)

Answer: \(\displaystyle .11\)

Example Question #822 : Numbers And Operations

Write \(\displaystyle 43\%\) as a decimal.

 

Possible Answers:

\(\displaystyle .043\)

\(\displaystyle .43\)

\(\displaystyle 4.3\)

\(\displaystyle 43\)

Correct answer:

\(\displaystyle .43\)

Explanation:

To convert a percentage to a decimal, divide by 100:

\(\displaystyle 43\div 100=.43\)

Answer: \(\displaystyle .43\)

Example Question #823 : Numbers And Operations

Convert the fraction to a percentage. 

\(\displaystyle \frac{7}{8}\)

Possible Answers:

\(\displaystyle 78\%\)

\(\displaystyle 87.5\%\)

\(\displaystyle 7.8\%\)

\(\displaystyle 56\%\)

Correct answer:

\(\displaystyle 87.5\%\)

Explanation:

To convert a fraction to a percentage, divide the numerator of the fraction by the denominator.  

\(\displaystyle \frac{7}{8}= 7\div8= .875\)

Move the decimal in the quotient two places to the right to create a percentage.   

\(\displaystyle 87.5\%\)

Example Question #824 : Numbers And Operations

What percentage does \(\displaystyle \frac{6}{25}\) represent?

Possible Answers:

\(\displaystyle 19\)\(\displaystyle \%\)

\(\displaystyle 24\)\(\displaystyle \%\)

\(\displaystyle 6\)\(\displaystyle \%\)

\(\displaystyle 25\)\(\displaystyle \%\)

\(\displaystyle 31\)\(\displaystyle \%\)

Correct answer:

\(\displaystyle 24\)\(\displaystyle \%\)

Explanation:

To get a fraction into a percentage you must turn it into a decimal.  

Make the fraction over \(\displaystyle 100\) so you must multiple it by \(\displaystyle 4\) 

\(\displaystyle 6*4=24, 25*4=100\).  

This gives you the decimal \(\displaystyle 0.24\) which you multiply by \(\displaystyle 100\) to give you \(\displaystyle 24%\)\(\displaystyle \%\).

Example Question #825 : Numbers And Operations

What is 0.036 as a percent?

Possible Answers:

\(\displaystyle 360\%\)

\(\displaystyle 3\%\)

\(\displaystyle 36\%\)

\(\displaystyle 3.6\%\)

Correct answer:

\(\displaystyle 3.6\%\)

Explanation:

Method 1:

Rewrite 0.036 as a fraction:

\(\displaystyle \frac{36}{1000}\)

Because percents are based on 100, divide the numerator and denominator by 10.

3.6%

 

Method 2:

Multiply \(\displaystyle 0.036 \times 100\)

To multiply by 100, move the decimal point two places to the right; then add the percent sign:

 

3.6% is the correct answer.

Example Question #154 : How To Find Percentage

75 out of 500 is what percent?

Possible Answers:

\(\displaystyle 10\%\)

\(\displaystyle 25\%\)

\(\displaystyle 20\%\)

\(\displaystyle 15\%\)

Correct answer:

\(\displaystyle 15\%\)

Explanation:

\(\displaystyle 75\) represents part of the whole which is \(\displaystyle 500\).  The fraction would be

\(\displaystyle \frac{75}{500}\)

Then, set up a proportion:

\(\displaystyle \frac{75}{500} = \frac{x}{100}\)

\(\displaystyle x\) represents the percent

Cross multiply:

\(\displaystyle 500x = 7500\)

Divide both sides by the coefficient of x, which is 500:

\(\displaystyle x = 15\)

Example Question #826 : Numbers And Operations

What is 0.467 as a percent?

Possible Answers:

\(\displaystyle 467\%\)

\(\displaystyle 46.7\%\)

\(\displaystyle 46\%\)

There is no solution.

Correct answer:

\(\displaystyle 46.7\%\)

Explanation:

Method 1:

Rewrite 0.467 as a fraction

\(\displaystyle \frac{467}{1000}\)

Divide numerator and denominator by 10.

 46.7 %

 

Method 2:

Multiply \(\displaystyle 0.467 x 100\)

Move the decimal in 0.467 to the right and add a % sign. 

The correct answer is 46.7%

Example Question #827 : Numbers And Operations

What is \(\displaystyle 40\%\) of \(\displaystyle 210\)?

Possible Answers:

\(\displaystyle 84\)

\(\displaystyle 40\)

\(\displaystyle 170\)

\(\displaystyle 250\)

Correct answer:

\(\displaystyle 84\)

Explanation:

To solve, multiply: \(\displaystyle 210 * .40=84\)

Answer: \(\displaystyle 84\)

Example Question #828 : Numbers And Operations

What is \(\displaystyle 80\%\) of \(\displaystyle 360\)?

Possible Answers:

\(\displaystyle 280\)

\(\displaystyle 440\)

\(\displaystyle 80\)

\(\displaystyle 288\)

Correct answer:

\(\displaystyle 288\)

Explanation:

To solve, multiply \(\displaystyle 360*.80=288\)

Answer: \(\displaystyle 288\)

Example Question #829 : Numbers And Operations

What is the percentage equivalent of \(\displaystyle .92\)?

Possible Answers:

\(\displaystyle 8\%\)

\(\displaystyle 29\%\)

\(\displaystyle 92\%\)

\(\displaystyle 9.2\%\)

Correct answer:

\(\displaystyle 92\%\)

Explanation:

To solve, multiply: \(\displaystyle .92*100=92\)

Answer: \(\displaystyle 92\%\)

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