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:

\(\displaystyle \frac{2}{13}\)

\(\displaystyle 2\frac{6}{25}\)

\(\displaystyle \frac{13}{2}\)

\(\displaystyle 1\frac{1}{25}\)

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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