GRE Math : How to simplify a fraction

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Example Question #7 :代数分数

A train travels at a constant rate ofmeters per second. How many kilometers does it travel inminutes? $(1\ km=1000\ m)$

Possible Answers:

Correct answer:

Explanation:

Set up the conversions as fractions and solve:

$\dpi{100} \small \frac{20m}{1sec}\times \frac{60sec^}{1min}\times \frac{1km}{1000m}\times \frac{10min}{1}$

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Example Question #1 :How To Simplify A Fraction

Which quantity is greater?

Quantity A

$\frac{6}{33}+\frac{17}{24}$

Quantity B

$\frac{17}{32}+\frac{7}{25}$

Possible Answers:

The relationship cannot be determined from the information given.

Quantity A is greater.

The two quantities are equal.

Quantity B is greater.

Correct answer:

Quantity A is greater.

Explanation:

This can be solved using 2 methods.

最time-efficient solution would recognize that $\frac{17}{24}$ is the largest value and nearly equals the sum the other fraction by itself.

The more time consuming method would be to convert each fraction to decimal form and calculate the sum of each quantity.

Quantity A: 0.1818+0.708=0.8898

Quantity B: 0.531+0.28=0.811

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Example Question #1 :代数分数

Simplify. $\frac{4x^{4}z^{3}}{2xz^{2}}$

Possible Answers:

Can't be simplified

$2x^{3}z$

$\frac{2x^{4}z^{3}}{xz}$

$2x^{4}z^{3}$

$4x^{3}z$

Correct answer:

$2x^{3}z$

Explanation:

To simplify exponents which are being divided, subtract the exponents on the bottom from exponents on the top. Remember that only exponents with the same bases can be simplified

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Example Question #9 :代数分数

Simplify:

$\frac{x^2-y^2}{x+y}$

Possible Answers:

$x-y,\ x+y$

x+y

2xy

x-y

Correct answer:

x-y

Explanation:

x²–y²can be also expressed as (x+y)(x–y).

Therefore, the fraction now can be re-written as (x+y)(x–y)/(x+y).

This simplifies to (x–y).

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Example Question #10 :代数分数

Simplify:

$\frac{x\sqrt{2}-2\sqrt{2}}{\sqrt{2x}+2}$

Possible Answers:

$\frac{x+2}{\sqrt{x-2}}$

$\sqrt{x}-\sqrt{2}$

$x-\sqrt{2}$

$\sqrt{x}+\sqrt{2}$

$x+\sqrt{2}$

Correct answer:

$\sqrt{x}-\sqrt{2}$

Explanation:

Notice that the $\sqrt{2}$ term appears frequently. Let's try to factor that out:

$\frac{x\sqrt{2}-2\sqrt{2}}{\sqrt{2x}+2} = \frac{\sqrt{2}*(x-2)}{\sqrt{2}*(\sqrt{x} +\sqrt{2})} = \frac{x-2}{\sqrt{x} +\sqrt{2}}$

Now multiply both the numerator and denominator by the conjugate of the denominator:

$\frac{x-2}{\sqrt{x} +\sqrt{2}} * \frac{\sqrt{x} -\sqrt{2}}{\sqrt{x} -\sqrt{2}} =\frac{(x-2)*(\sqrt{x} -\sqrt{2})}{x-2} =\sqrt{x} -\sqrt{2}$

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Example Question #1 :代数分数

Simplify:

(2x+ 4)/(x+ 2)

Possible Answers:

x+ 2

x+ 1

2x+ 2

x+ 4

Correct answer:

Explanation:

(2x+ 4)/(x+ 2)

为了简化polynomi顶部首先必须因素al to 2(x+ 2). You may then eliminate the identical (x+ 2) from the top and bottom leaving 2.

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Example Question #2 :代数分数

Simplify the following expression:

$\frac{2x^{4}-32}{2x^{2}-8}$

Possible Answers:

$2$

$x^{2}-4$

$(x+2)(x-2)$

$x^{2}+4$

$2(x^{2}-4)$

Correct answer:

$x^{2}+4$

Explanation:

Factor both the numerator and the denominator:

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

After reducing the fraction, all that remains is:

$(x^{2}+4)$

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Example Question #3 :代数分数

Simplify:

$\frac{x^{2}y-5x^{2}y^{2}}{x^{2}y}$

Possible Answers:

1-5y

None of the other answers

1-5x

y-5y

$5+x^{2}y^{2}$

Correct answer:

1-5y

Explanation:

With this problem the first thing to do is cancel out variables. The x²can all be divided by each other because they are present in each system. The equation will now look like this:

$\frac{y-5y^{2}}{y}$

Now we can see that the equation can all be divided by y, leaving the answer to be:

1-5y

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Example Question #2 :How To Simplify A Fraction

Simplify the given fraction:

$\frac{120}{6000}$

Possible Answers:

$\frac{1}{5}$

$\frac{1}{20}$

$\frac{1}{50}$

$\frac{1}{100}$

$\frac{2}{25}$

Correct answer:

$\frac{1}{50}$

Explanation:

120 goes into 6000 evenly 50 times, so we get 1/50 as our simplified fraction.

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Example Question #3 :How To Simplify A Fraction

Simplify the given fraction:

$\frac{125}{2000}$

Possible Answers:

$\frac{2}{16}$

$\frac{5}{16}$

$\frac{1}{8}$

$\frac{1}{16}$

$\frac{1}{32}$

Correct answer:

$\frac{1}{16}$

Explanation:

125 goes into 2000 evenly 16 times. 1/16 is the fraction in its simplest form.

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GRE Math : How to simplify a fraction

Study concepts, example questions & explanations for GRE Math

All GRE Math Resources

Example Questions

Example Question #7 :代数分数

Example Question #1 :How To Simplify A Fraction

Example Question #1 :代数分数

Example Question #9 :代数分数

Example Question #10 :代数分数

Example Question #1 :代数分数

Example Question #2 :代数分数

Example Question #3 :代数分数

Example Question #2 :How To Simplify A Fraction

Example Question #3 :How To Simplify A Fraction

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