ISEE Middle Level Math : How to divide fractions

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

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Example Questions

Example Question #1401 : Isee Middle Level (Grades 7 8) Mathematics Achievement

\displaystyle \frac{4^{^{2}}+\left ( 12-4 \right )}{2}

Possible Answers:

\displaystyle 12

\displaystyle 36

\displaystyle 16

\displaystyle 8

\displaystyle 0

Correct answer:

\displaystyle 12

Explanation:

In order to solve:

First, solve the exponent equation within the numerator portion of the fraction:

\displaystyle \small \small \frac{4^{2} + \left ( 12-4 \right )}{2}=

Then, solve the equation within the parentheses:

\displaystyle \small \small \frac{16+8}{2}=

Then, solve the entire equation in the numerator portion and divide the numerator by the denominator.

\displaystyle \small \small \frac{24}{2}=12

Answer: 12

Example Question #511 : Numbers And Operations

\displaystyle \small 2 \frac{1}{5} \div 1 \frac{2}{4}=

 

Possible Answers:

\displaystyle \small 3 \frac{3}{10}

\displaystyle \small 2 \frac{1}{10}

\displaystyle \small 4

\displaystyle \small 1 \frac{7}{15}

Correct answer:

\displaystyle \small 1 \frac{7}{15}

Explanation:

To solve:

First, turn the mixed fractions into improper fractions.

\displaystyle \small \small \small \frac{11}{5}\div \frac{6}{4}=

Then, change the operation to multiplication and flip the second fraction. Solve accordingly and simplify the answer if possible.

\displaystyle \small \small \frac{11}{5}\cdot \frac{4}{6}=

The answer is \displaystyle \small 1\frac{7}{15}.

 

Example Question #511 : Numbers And Operations

What is \displaystyle \frac{3}{5} divided by \displaystyle \frac{3}{25}?

Possible Answers:

\displaystyle 5

\displaystyle \frac{3}{5}

\displaystyle \frac{1}{5}

\displaystyle 3

\displaystyle 15

Correct answer:

\displaystyle 5

Explanation:

\displaystyle \frac{3}{5}\div\frac{3}{25}=\frac{3}{5}\cdo*\frac{25}{3}=5

Example Question #1 : How To Divide Fractions

Evaluate:

 \displaystyle \frac{\frac{2}{7}}{\frac{9}{14}}

Possible Answers:

\displaystyle \frac{4}{9}

\displaystyle \frac{49}{9}

\displaystyle \frac{9}{4}

\displaystyle \frac{13}{14}

\displaystyle \frac{9}{4 9}

Correct answer:

\displaystyle \frac{4}{9}

Explanation:

Rewrite this horizontally as a division expression, rewrite as a product, cross-cancel, and multply across:

\displaystyle \frac{\frac{2}{7}}{\frac{9}{14}}  \displaystyle = \frac{2}{7} \div \frac{9}{14} = \frac{2}{7} \cdot \frac{14}{9} = \frac{2}{1} \cdot \frac{2}{9} = \frac{2\cdot 2}{1\cdot 9} =\frac{4}{9}

Example Question #1 : How To Divide Fractions

\displaystyle \frac{2}{5}\div 2\frac{3}{5}=

Possible Answers:

\displaystyle \frac{2}{13}

\displaystyle 2\frac{6}{25}

\displaystyle 1\frac{1}{25}

\displaystyle \frac{13}{2}

Correct answer:

\displaystyle \frac{2}{13}

Explanation:

First, convert each fraction into an improper fraction

\displaystyle \frac{2}{5}\div 2\frac{3}{5}=\frac{2}{5}\div \frac{13}{5}=

Then, change the operation to mulitplication and flip the second fraction:

\displaystyle \frac{2}{5}*\frac{5}{13}=

Reduce and solve accordingly:

Answer: \displaystyle \frac{2}{13}

Example Question #2 : How To Divide Fractions

\dpi{100} 9\div \frac{1}{7}=\displaystyle \dpi{100} 9\div \frac{1}{7}=

Possible Answers:

\dpi{100} \frac{9}{7}\displaystyle \dpi{100} \frac{9}{7}

\dpi{100} 1\displaystyle \dpi{100} 1

\dpi{100} \frac{7}{9}\displaystyle \dpi{100} \frac{7}{9}

\dpi{100} 63\displaystyle \dpi{100} 63

Correct answer:

\dpi{100} 63\displaystyle \dpi{100} 63

Explanation:

We never actually divide fractions.  When given a division problem, you multiply by the reciprocal of the 2nd fraction. 

So, \dpi{100} 9\div \frac{1}{7}\displaystyle \dpi{100} 9\div \frac{1}{7} becomes \dpi{100} 9\times \frac{7}{1}\displaystyle \dpi{100} 9\times \frac{7}{1}.

This is the same as \dpi{100} 9\times7=63\displaystyle \dpi{100} 9\times7=63

Example Question #2 : How To Divide Fractions

Divide: \displaystyle 0.17 \div 32

Possible Answers:

\displaystyle 0.01882

\displaystyle 0.001882

\displaystyle 0.0053125

\displaystyle 0.053125

\displaystyle 0.53125

Correct answer:

\displaystyle 0.0053125

Explanation:

Simply use the long division process. The quotient will be: 

\displaystyle 0.17 \div 32 = 0.0053125

Example Question #3 : How To Divide Fractions

Solve:

\displaystyle \frac{3}{4}\div \frac{1}{3}

Possible Answers:

\displaystyle \frac{9}{4}

\displaystyle 4

\displaystyle \frac{1}{4}

\displaystyle \frac{4}{9}

Correct answer:

\displaystyle \frac{9}{4}

Explanation:

\displaystyle \frac{3}{4}\div\frac{1}{3}=\frac{3}{4}\times\frac{3}{1}=\frac{9}{4}

Example Question #4 : How To Divide Fractions

Simplify: \displaystyle \frac{\frac{2}{7}}{\frac{9}{14}}

Possible Answers:

\displaystyle \frac{2}{9}

\displaystyle \frac{13}{14}

\displaystyle \frac{5}{14}

\displaystyle \frac{9}{49}

\displaystyle \frac{4}{9}

Correct answer:

\displaystyle \frac{4}{9}

Explanation:

Rewrite this as a division, dividing the numerator by the denominator:

\displaystyle \frac{\frac{2}{7}}{\frac{9}{14}} = \frac{2}{7} \div \frac{9}{14} = \frac{2}{7} \times \frac{14}{9}= \frac{2}{1} \times \frac{2}{9}=\frac{2 \times 2}{1 \times 9}= \frac{4}{9}

Example Question #5 : How To Divide Fractions

Simplify: 

\displaystyle \frac{\frac{2}{5}}{\frac{7}{10}}

Possible Answers:

\displaystyle \frac{11}{10}

\displaystyle \frac{7}{25}

\displaystyle \frac{4}{7}

\displaystyle \frac{7}{4}

\displaystyle \frac{25}{7}

Correct answer:

\displaystyle \frac{4}{7}

Explanation:

Rewrite as a division, then solve:

\displaystyle \frac{\frac{2}{5}}{\frac{7}{10}} = \frac{2}{5} \div \frac{7}{10} = \frac{2}{5} \times \frac{10}{7} = \frac{2}{1} \times \frac{2}{7} = \frac{4}{7}

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