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ACT Math : Algebraic Fractions

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Example Questions

Example Question #3 : Algebraic Fractions

$\frac{34}{5}$

Change to a mixed number

Possible Answers:

$6\frac{4}{5}$

$34\frac{1}{5}$

$3\frac{4}{5}$

$4 \frac{6}{5}$

$4 \frac{5}{6}$

Correct answer:

$6\frac{4}{5}$

Explanation:

To convert from a fraction to a mixed number we must find out how many times the denominator goes into the numerator using division and the remainder becomes the new fraction.

$\frac{34}{5} = 6\ r 4 \ so \6\frac{4}{5}$

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Example Question #3 : Algebraic Fractions

What is the average of $\frac{2}{3}$ and $\frac{5}{6}$ ?

Possible Answers:

$\frac{3}{4}$

$\frac{6}{7}$

$\frac{11}{12}$

$\frac{4}{5}$

Correct answer:

$\frac{3}{4}$

Explanation:

To average, we have to add the values and divide by two. To do this we need to find a common denomenator of 6. We then add and divide by 2, yielding 4.5/6. This reduces to 3/4.

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Example Question #4 : Algebraic Fractions

Which of the following is equivalent to $\frac{x}{2}+\frac{x-5}{x+3}$ ?

Possible Answers:

None of the answers are correct

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

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

$\frac{x^{2}+5x-10}{2x+6}$

$\frac{x^{2}-5x+10}{2x+6}$

Correct answer:

$\frac{x^{2}+5x-10}{2x+6}$

Explanation:

This problem is solved the same way ½ + 1/3 is solved. For example, ½ + 1/3 = 3/6 + 2/6 = 5/6. Find a common denominator then convert each fraction into an equivalent fraction using that common denominator. The final step is to add the two new fractions and simplify.

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Example Question #1 : How To Simplify A Fraction

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

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 #4 : Algebraic Fractions

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

Possible Answers:

$4x^{3}z$

$2x^{3}z$

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

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

Can't be simplified

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 #5 : Algebraic Fractions

Simplify:

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

Possible Answers:

x-y

$x-y,\ x+y$

x+y

2xy

Correct answer:

x-y

Explanation:

x² – y² can 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 #3 : How To Simplify A Fraction

Simplify:

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

Possible Answers:

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

$x+\sqrt{2}$

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

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

$x-\sqrt{2}$

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 #11 : Algebraic Fractions

Simplify:

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

Possible Answers:

x + 4

x + 2

x + 1

2x + 2

Correct answer:

Explanation:

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

To simplify you must first factor the top polynomial 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 #1 : Algebraic Fractions

Simplify the following expression:

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

Possible Answers:

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

$x^{2}-4$

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

$x^{2}+4$

$2$

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 #2 : Algebraic Fractions

Simplify:

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

Possible Answers:

y-5y

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

1-5x

1-5y

None of the other answers

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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ACT Math : Algebraic Fractions

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #3 : Algebraic Fractions

Example Question #3 : Algebraic Fractions

Example Question #4 : Algebraic Fractions

Example Question #1 : How To Simplify A Fraction

Example Question #4 : Algebraic Fractions

Example Question #5 : Algebraic Fractions

Example Question #3 : How To Simplify A Fraction

Example Question #11 : Algebraic Fractions

Example Question #1 : Algebraic Fractions

Example Question #2 : Algebraic Fractions

All ACT Math Resources

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