GRE Math : Mixed / Improper Fractions

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Example Question #1 : Mixed / Improper Fractions

and are positive integers.

is a multiple of .

Quantity A: $\frac{x^5}{x^y}$

Quantity B: $x^{5/y}$

Possible Answers:

The relationship cannot be determined.

The two quantities are equal.

Quantity B is greater.

Quantity A is greater.

Correct answer:

The relationship cannot be determined.

Explanation:

Recall that the exponent of the denominator is sutracted from the exponent of the numerator.

Therefore Quantity A is equivalent to x^5–y, and because we would then be comparing an arithmetic operation to a geometric operation, it does not matter whether y is a multiple of 5. The two quantities cannot be compared.

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Example Question #2 : Mixed / Improper Fractions

Which of the following is the mixed fraction equivalent to $\frac{19}{3}$ ?

Possible Answers:

$6\frac{3}{5}$

$6\frac{1}{3}$

$\frac{13}{3}$

$8\frac{2}{3}$

$\frac{3}{19}$

Correct answer:

$6\frac{1}{3}$

Explanation:

To begin, notice that using your calculator, you can find:

$\frac{19}{3} = 6.33333...$

Now, the closest even multiple of that is less than is . Therefore, you know that your number is:

$\frac{19}{3}=\frac{18}{3}+\frac{1}{3}$

This is the same as:

$6+\frac{1}{3}$ , or simply, $6\frac{1}{3}$ . This is your mixed fraction.

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Example Question #4 : Mixed / Improper Fractions

Which of the following is equivalent to $\frac{82}{4}$ ?

Possible Answers:

$15\frac{1}{2}$

$20\frac{1}{4}$

$15\frac{3}{4}$

$20\frac{3}{8}$

$20\frac{1}{2}$

Correct answer:

$20\frac{1}{2}$

Explanation:

Although there are many ways to convert improper fractions into mixed fractions, the easiest way is to use your calculator to your advantage. Begin by dividing by . This gives you 20.5 . Therefore, you can eliminate all the options that have do not have for their first portion. Next, multiply 0.5 by the denominator (), and get . This means that you have and $\frac{2}{4}$ , or $\frac{1}{2}$ . Thus, your answer is $20\frac{1}{2}$ .

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Example Question #1 : How To Find Out A Mixed Fraction From An Improper Fraction

Quantity A: $\frac{490}{12}$

Quantity B: $40\frac{5}{6}$

Which of the following is true?

Possible Answers:

Quantity B is larger.

Quantity A is larger.

The relationship of the two quantities cannot be determined based on the information provided.

The two quantities are equal

Correct answer:

The two quantities are equal

Explanation:

Though there are several ways you could solve this, let's convert the improper fraction into a mixed one so we can compare them. Start by dividing 490 by . This gives you 40.833333...

Now, since we know that the two numbers have the same whole-number value, we need to compare their decimal portions. Compare 0.833333... to $\frac{5}{6}$ . The latter is indeed Therefore, the two values are equal.

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Example Question #1522 : Act Math

Write $71\frac{5}{7}$ as an improper fraction.

Possible Answers:

$\frac{355}{7}$

$\frac{76}{8}$

$\frac{76}{7}$

$\frac{360}{7}$

$\frac{502}{7}$

Correct answer:

$\frac{502}{7}$

Explanation:

To find the improper fraction value, we must effectively add together 71 and ⁵/₇. To do this, we will give 71 a denominator of 7; therefore, we are transforming ⁷¹/₁ to ^x/₇. The shortest way to do this is to multiply by ⁷/₇ (which really is 1); therefore, 71 = 71 * (⁷/₇) = ⁴⁹⁷/₇.

Now add them: ^{(497 + 5)}/₇ = ⁵⁰²/₇

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Example Question #1523 : Act Math

Which of the following improper fractions is equivalent to $14\frac{2}{5}$ ?

Possible Answers:

$\frac{70}{5}$

$\frac{72}{5}$

$\frac{24}{5}$

$\frac{84}{3}$

$\frac{16}{5}$

Correct answer:

$\frac{72}{5}$

Explanation:

To find an improper fraction, you need to multiply the whole number that you have by the denominator of the associated fraction. For our problem, this means that you will multiply by , getting . Next, you add this to the numerator of your fraction, giving you 70+2 , or . Finally, you place this over your original denominator, giving you:

$\frac{72}{5}$

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Example Question #1 : How To Find Out An Improper Fraction From A Mixed Fraction

Which of the following improper fractions is equivalent to $27\frac{4}{19}$ ?

Possible Answers:

$\frac{517}{19}$

$\frac{49}{19}$

$\frac{481}{19}$

$\frac{31}{19}$

$\frac{813}{17}$

Correct answer:

$\frac{517}{19}$

Explanation:

To find an improper fraction, you need to multiply the whole number that you have by the denominator of the associated fraction. For our problem, this means that you will multiply by , getting 513 . Next, you add this to the numerator of your fraction, giving you 513+4 , or 517 . Finally, you place this over your original denominator, giving you:

$\frac{517}{19}$

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GRE Math : Mixed / Improper Fractions

Study concepts, example questions & explanations for GRE Math

All GRE Math Resources

Example Questions

Example Question #1 : Mixed / Improper Fractions

Example Question #2 : Mixed / Improper Fractions

Example Question #4 : Mixed / Improper Fractions

Example Question #1 : How To Find Out A Mixed Fraction From An Improper Fraction

Example Question #1522 : Act Math

Example Question #1523 : Act Math

Example Question #1 : How To Find Out An Improper Fraction From A Mixed Fraction

All GRE Math Resources

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