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PSAT Math : How to divide fractions

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Example Questions

Example Question #3 : Operations With Fractions

Simplify:

Possible Answers:

a/b/c/d

ac/bd

It is already in simplest terms

ad/bc

a²/c²

Correct answer:

ad/bc

Explanation:

Division is the same as multiplying by the reciprocal. Thus, a/b ÷ c/d = a/b x d/c = ad/bc

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Example Question #101 : Fractions

If p is a positive integer, and 4 is the remainder when p-8 is divided by 5, which of the following could be the value of p?

Possible Answers:

Correct answer:

Explanation:

Remember that if x has a remainder of 4 when divided by 5, x minus 4 must be divisible by 5. We are therefore looking for a number p such that p - 8 - 4 is divisible by 5. The only answer choice that fits this description is 17.

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Example Question #1 : How To Divide Fractions

If $\dpi{100} \small x=\frac{2}{3}$ and $\dpi{100} \small y= \frac {3}{4}$ , then what is the value of $\dpi{100} \small \frac {x}{y}$ ?

Possible Answers:

$\dpi{100} \small \frac{5}{7}$

$\dpi{100} \small \frac{8}{9}$

$\dpi{100} \small 2$

$\dpi{100} \small \frac{1}{2}$

$\dpi{100} \small \frac{9}{8}$

Correct answer:

$\dpi{100} \small \frac{8}{9}$

Explanation:

Dividing by a number (in this case $\dpi{100} \small \frac {3}{4}$ ) is equivalent to multiplying by its reciprocal (in this case $\dpi{100} \small \frac {4}{3}$ ). Therefore:

$\dpi{100} \small \frac {2}{3}\div \frac{3}{4} = \frac{2}{3}\times \frac{4}{3} = \frac{8}{9}$

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Example Question #611 : Arithmetic

Evaluate the following:

$\left ( \frac{5}{6}\times \frac{12}{13} \right )^{2}\div \frac{3}{4}$

Possible Answers:

$\frac{25}{507}$

None of the available answers

$\frac{400}{507}$

$\frac{4}{5}$

$\frac{507}{400}$

Correct answer:

$\frac{400}{507}$

Explanation:

$\left ( \frac{5}{6}\times \frac{12}{13} \right )^{2}\div \frac{3}{4}$

First we will evaluate the terms in the parentheses:

$\left ( \frac{5}{6}\times \frac{2\times 6}{13} \right )^{2}\div \frac{3}{4}$

$\left ( \frac{5}{1}\times \frac{2}{13} \right )^{2}\div \frac{3}{4}$

$\left ( \frac{10}{13} \right )^{2}\div \frac{3}{4}$

Next, we will square the first fraction:

$\left ( \frac{10^{2}}{13^{2}} \right )\div \frac{3}{4}$

$\frac{100}{169}\div \frac{3}{4}$

We can evaluate the division as such:

$\frac{100}{169}\times\frac{4}{3}=\frac{400}{507}$

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Example Question #2 : How To Divide Fractions

Simplify: $\frac{\frac{3x}{2}}{\frac{5x}{4}}$

Possible Answers:

$\frac{6}{5}$

$\frac{15x}{2}$

$\frac{15x}{8}$

$\frac{15x^{2}}{8}$

Correct answer:

$\frac{6}{5}$

Explanation:

Start by rewriting this fraction as a division problem:

$\frac{3x}{2}\div \frac{5x}{4}$

When dividing fractions, you multiply by the reciprocal of the second fraction, so you can rewrite your problem like this:

$\frac{3x}{2}\times \frac{4}{5x}$

Multiply across the numerators and then across the denominators to get $\frac{12x}{10x}$ . The x's cancel, and you can reduce the fraction to be $\frac{6}{5}$ .

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Example Question #1 : How To Divide Fractions

Define an operation $\otimes \;$ as follows:

For all real numbers a ,b ,

$a \otimes b = \frac{4-a}{b}$ .

Evaluate $1 \frac{1}{2} \otimes 2 \frac{1}{3}$ .

Possible Answers:

$\frac{14}{15}$

$1 \frac{1}{14}$

$1\frac{1}{6}$

$5\frac{5}{6}$

$\frac{6}{35}$

Correct answer:

$1 \frac{1}{14}$

Explanation:

$a \otimes b = \frac{4-a}{b}$ , or, equivalently,

$a \otimes b =( 4-a ) \div b$

$1 \frac{1}{2} \otimes 2 \frac{1}{3} =\left ( 4-1 \frac{1}{2} \right ) \div 2 \frac{1}{3}$

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

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

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

$= \frac{15}{14}$

$= 1 \frac{1}{14}$

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Example Question #1 : How To Divide Fractions

Define an operation $\odot$ as follows:

For all real numbers a ,b ,

$a \odot b = \frac{a}{b+2}$ .

Evaluate $\frac{3}{5} \odot \frac{1}{5}$ .

Possible Answers:

$3\frac{2}{3}$

$1\frac{8}{25}$

$\frac{25}{33}$

$\frac{3} {11}$

Correct answer:

$\frac{3} {11}$

Explanation:

$a \odot b = \frac{a}{b+2}$ ,

or, equivalently,

$a \odot b = a \div\left ( b+2 \right )$

$\frac{3}{5} \odot \frac{1}{5}= \frac{3}{5} \div \left (\frac{1}{5}+2 \right )$

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

$= \frac{3}{5} \cdot \frac{5}{11}$

$= \frac{3}{1} \cdot \frac{1}{11}$

$= \frac{3} {11}$

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Example Question #5 : How To Divide Fractions

Define an operation $\blacklozenge$ as follows:

For all real numbers a ,b ,

$a \; \blacklozenge \; b = a \div b^{2}$ .

Evaluate $25 \; \blacklozenge \; 6\frac{1}{4}$ .

Possible Answers:

100

$\frac{16} {25}$

$976\frac{9}{16}$

$\frac{4}{25}$

Correct answer:

$\frac{16} {25}$

Explanation:

$a \; \blacklozenge \; b = a \div b^{2}$

$25 \; \blacklozenge \; 6\frac{1}{4}= 25 \div \left ( 6\frac{1}{4} \right ) ^{2}$

$= 25 \div \left ( \frac{25}{4} \right ) ^{2}$

$= 25 \div \left ( \frac{625}{16} \right )$

$= \frac{25 }{1}\times \left ( \frac{16} {625}\right )$

$= \frac{1}{1}\times \left ( \frac{16} {25}\right )$

$= \frac{16} {25}$

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Example Question #12 : Operations With Fractions

Define an operation $\ominus$ as follows:

For all real numbers a ,b ,

$a \; \ominus \; b = a^{2} \div b$ .

Evaluate $16 \; \ominus \; 3\frac{1}{5}$ .

Possible Answers:

$1\frac{9}{16}$

$819\frac{1}{5}$

$\frac{5}{16}$

Correct answer:

Explanation:

$a \; \ominus \; b = a^{2} \div b$

$16 \; \ominus \; 3\frac{1}{5} = 16^{2} \div 3\frac{1}{5}$

$= 256 \div \frac{16}{5}$

$= \frac{256 }{1}\times \frac{5}{16}$

$= \frac{16}{1}\times \frac{5}{1}$

$= 16 \times 5 = 80$

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Example Question #7 : How To Divide Fractions

Define an operation $\amalg$ as follows:

For all real numbers a ,b ,

$a \amalg b = 5 - \frac{a}{b}$ .

Evaluate $1 \frac{1}{2}\; \amalg \; 2 \frac{1}{3}$ .

Possible Answers:

$3\frac{4}{9}$

$1\frac{1}{2}$

$4 \frac{5}{14}$

The correct answer is not among the other responses.

$4\frac{5}{7}$

Correct answer:

$4 \frac{5}{14}$

Explanation:

$a \amalg b = 5 - \frac{a}{b}$

or, equivalently,

$a \amalg b = 5 - a \div b$

$1 \frac{1}{2}\; \amalg \; 2 \frac{1}{3}= 5 - 1 \frac{1}{2} \div 2 \frac{1}{3}$

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

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

$= 5 - \frac{9}{14}$

$= 4 \frac{5}{14}$

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PSAT Math : How to divide fractions

Study concepts, example questions & explanations for PSAT Math

All PSAT Math Resources

Example Questions

Example Question #3 : Operations With Fractions

Example Question #101 : Fractions

Example Question #1 : How To Divide Fractions

Example Question #611 : Arithmetic

Example Question #2 : How To Divide Fractions

Example Question #1 : How To Divide Fractions

Example Question #1 : How To Divide Fractions

Example Question #5 : How To Divide Fractions

Example Question #12 : Operations With Fractions

Example Question #7 : How To Divide Fractions

All PSAT Math Resources

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