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ISEE Middle Level Math : How to divide fractions

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6 Diagnostic Tests 303 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #316 : Concepts

Simplify:

$\frac{ 2 \frac{1}{5}}{7 \frac{1}{3}}$

Possible Answers:

$\frac{4}{15}$

$\frac{1}{30}$

$3\frac{1}{3}$

$\frac{3}{10}$

Correct answer:

$\frac{3}{10}$

Explanation:

Rewrite as a division, then solve:

$\frac{ 2 \frac{1}{5}}{7 \frac{1}{3}}$

$= 2 \frac{1}{5} \div 7 \frac{1}{3}$

$= \frac{1+ 2 \times 5}{5} \div \frac{1+ 7 \times 3}{3}$

$= \frac{11}{5} \div \frac{22}{3}$

$= \frac{11}{5} \times \frac{3}{22}$

$= \frac{1}{5} \times \frac{3}{2} = \frac{1 \times 3}{5 \times 2} = \frac{3}{10}$

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Example Question #11 : How To Divide Fractions

Evaluate:

$\sqrt{3}\div \frac{3}{4}$

Possible Answers:

$\frac{3\sqrt{3}}{4}$

$4\sqrt{3}$

$\frac{4\sqrt{3}}{3}$

$\sqrt{3}$

$\frac{4}{3}$

Correct answer:

$\frac{4\sqrt{3}}{3}$

Explanation:

To divide any number by a fraction, we can multiply that number by the reciprocal of the fraction. That means:

$\frac{a}{b}\div \frac{c}{d} = \frac{a}{b}\times \frac{d}{c}=\frac{ad}{bc}$

So we have:

$\sqrt{3}\div \frac{3}{4}= \frac{\sqrt{3}}{1}\times \frac{4}{3}$

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

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Example Question #12 : How To Divide Fractions

Simplify:

$\frac{2+\frac{5}{6}}{2-\frac{5}{6}}$

Possible Answers:

$\frac{17}{7}$

$\frac{5}{6}$

$\frac{17}{6}$

$\frac{7}{17}$

Correct answer:

$\frac{17}{7}$

Explanation:

Multiply each term by 6:

$\frac{2+\frac{5}{6}}{2-\frac{5}{6}} = \frac{12+5}{12-5}$

$=\frac{17}{7}$

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Example Question #13 : How To Divide Fractions

Evaluate:

$8\frac{1}{3}\div \frac{1}{6}$

Possible Answers:

$\frac{50}{6}$

$\frac{50}{3}$

Correct answer:

Explanation:

A mixed number represents the sum of an integer and a fraction. In order to evaluate this problem first we need to change the mixed number ( $8\frac{1}{3}$ ) to an improper fraction. Improper fractions are fractions whose numerator is greater than the denominator. So we can write:

$8\frac{1}{3}=\frac{8\times 3+1}{3}=\frac{25}{3}$

Now we should evaluate $\frac{25}{3}\div \frac{1}{6}$ and we have:

$\frac{25}{3}\div \frac{1}{6}=\frac{25}{3}\times \frac{6}{1}=50$

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Example Question #14 : How To Divide Fractions

Simplify:

$\frac{\frac{4}{x}}{(\frac{1}{x}-4x)}$

Possible Answers:

$\frac{1}{(1+4x^2)}$

$\frac{1}{(1-4x^2)}$

$\frac{4}{(1-4x^2)}$

$\frac{1}{(1-x^2)}$

$\frac{4}{(1+4x^2)}$

Correct answer:

$\frac{4}{(1-4x^2)}$

Explanation:

We can first find a common denominator for the expression in the numerator, which is . This gives us:

$\frac{\frac{4}{x}}{\left(\frac{1}{x}-\frac{4x^2}{x}\right)}=\frac{\frac{4}{x}}{\left(\frac{1-4x^2}{x}\right)}$

$=\frac{4}{x}\times \left(\frac{x}{1-4x^2}\right)$

$=\frac{4}{(1-4x^2)}$

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Example Question #15 : How To Divide Fractions

Which of the following is the reciprocal of $-1 \frac {4}{5}$ ?

Possible Answers:

$\frac {5}{9}$

$1 \frac {4}{5}$

$-\frac {5}{9}$

$-5 \frac {1}{4}$

Correct answer:

$-\frac {5}{9}$

Explanation:

First, rewrite this as an improper fraction:

$-1 \frac {4}{5} =-\frac {5 \times 1+ 4}{5}= -\frac {9}{5}$

The reciprocal of an improper fraction can be found by switching its numerator and denominator, retaining the negative sign, so the reciprocal is $-\frac {5}{9}$ .

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Example Question #16 : How To Divide Fractions

Which of the following is the reciprocal of 2.8?

Possible Answers:

$\frac{5}{14}$

$-2 \frac{4}{5}$

$2 \frac{4}{5}$

$\frac{2}{7}$

Correct answer:

$\frac{5}{14}$

Explanation:

First, rewrite this as an improper fraction:

$2.8 = \frac{28}{10} = \frac{28\div 2}{10\div 2} = \frac{14}{5}$

The reciprocal of an improper fraction can be found by switching its numerator and denominator, so the reciprocal is $\frac{5}{14}$ .

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Example Question #17 : How To Divide Fractions

Solve:

$\frac{3}{7}\div \frac{1}{5}$

Possible Answers:

$\frac{15}{7}$

$\frac{3}{2}$

$\frac{1}{2}$

$\frac{3}{35}$

Correct answer:

$\frac{15}{7}$

Explanation:

$\frac{3}{7}\div \frac{1}{5}=\frac{3}{7}\times \frac{5}{1}=\frac{15}{7}$

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Example Question #18 : How To Divide Fractions

Which of the following is the reciprocal of 31.25?

Possible Answers:

0.024

0.032

0.028

0.036

Correct answer:

0.032

Explanation:

Rewrite 31.25 as a fraction:

$31.25 = \frac{3,125}{100} = \frac{3,125\div 25}{100\div 25} = \frac{125}{4}$

Exchange the positions of the numerator and the denominator to get $\frac{4}{125}$ . Now divide 4 by 125:

$\frac{4}{125} = 4 \div 125 = 0.032$

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Example Question #19 : How To Divide Fractions

Solve:

$\frac{9}{10}\div \frac{3}{5}=$

Possible Answers:

$\frac{2}{3}$

$\small \frac{6}{5}$

$\frac{3}{2}$

$\frac{5}{6}$

Correct answer:

$\frac{3}{2}$

Explanation:

$\small \frac{9}{10}\div \frac{3}{5}=\frac{9}{10}\times\frac{5}{3}=\frac{45}{30}=\frac{3}{2}$

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All ISEE Middle Level Math Resources

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ISEE Middle Level Math : How to divide fractions

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

All ISEE Middle Level Math Resources

Example Questions

Example Question #316 : Concepts

Example Question #11 : How To Divide Fractions

Example Question #12 : How To Divide Fractions

Example Question #13 : How To Divide Fractions

Example Question #14 : How To Divide Fractions

Example Question #15 : How To Divide Fractions

Example Question #16 : How To Divide Fractions

Example Question #17 : How To Divide Fractions

Example Question #18 : How To Divide Fractions

Example Question #19 : How To Divide Fractions

All ISEE Middle Level Math Resources

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