ACT Math : Operations and Fractions

Study concepts, example questions & explanations for ACT Math

varsity tutors app store varsity tutors android store varsity tutors amazon store varsity tutors ibooks store

Example Questions

← Previous 1

Example Question #1 : Operations And Fractions

What value of s makes the equation \frac{7}{s}=\frac{8}{10} true?

Possible Answers:

9.5

9

8.75

9.25

7.5

Correct answer:

8.75

Explanation:

We can simply cross multiply to obtain 70=8s and divide by 8 to solve for s.

Example Question #2 : Operations And Fractions

Simplfiy the following expression;

Possible Answers:

Correct answer:

Explanation:

Multiply the numerators  2 x 6 x 4 = 48. Then multiply the denominators 3 x 8 x 12 = 288.  The answer is 48/288. To simplify, divide both numerator and denominator by 48 to get 1/6.

 

Example Question #3 : Operations And Fractions

Evaluate –3–2 * 2–3.

Possible Answers:

Correct answer:

Explanation:

Because the exponents are negative, we can convert –3–2  to 1/9 and 2–3 to 1/8. We then multiply straight across the top and the bottom, giving you 1/72.

Example Question #4 : Operations And Fractions

Simplify the following into one fraction

Possible Answers:

Correct answer:

Explanation:

To multiply fractions you multiply the entire numerator and the entire denominator together. However, before we do that we can cancel anything from the denominator with anything in the numerator. 

Six cancels with 12

5 cancels with 25 

multiply it all out and get

Example Question #5 : Operations And Fractions

\dpi{100} \small \frac{1}{3}\div \frac{3}{5} =

Possible Answers:

\dpi{100} \small \frac{1}{5}

\dpi{100} \small \frac{2}{3}

\dpi{100} \small \frac{2}{5}

\dpi{100} \small \frac{5}{9}

\dpi{100} \small \frac{3}{8}

Correct answer:

\dpi{100} \small \frac{5}{9}

Explanation:

Cross multiply or multiply using the reciprocal of the second fraction. 

Example Question #6 : Operations And Fractions

Simplify the following expression:

 

 

Possible Answers:

Correct answer:

Explanation:

 

 

 

 

 

 

Example Question #7 : Operations And Fractions

Evaluate the following:

 

Possible Answers:

Correct answer:

Explanation:

Start by converting 71/to 22/3, and 6 2/to 20/3. We then multiply 22/3 by the reciprocal of 20/3, 3/20, and you get 66/60. This simplifies to 11/10.

Example Question #8 : Operations And Fractions

Solve.

 

Possible Answers:

Correct answer:

Explanation:

Remember, to divide a number by a fraction, multiply the number by the reciprocal of the fraction. In this case,

Example Question #9 : Operations And Fractions

Solve for x where

 

 

Possible Answers:

Correct answer:

Explanation:

To solve this, subtract 1 1/2 from both sides. Convert to common denominators.

4 1/3 – 1 1/2 = 4 2/6 – 1 3/6.

In order to subtract, you'll want to "borrow" from the 4 2/6. Rewrite 4 2/6 as 3 8/6 and then subtract 1 3/6 from this. Your solution is 2 5/6. Most calculators will also do these calculations for you.

Example Question #10 : Operations And Fractions

Solve for :

Possible Answers:

Correct answer:

Explanation:

Begin by isolating your variable:

Next, you need to find the common denominator. For the left side of your equation, it is . For the right, it is . This means that you need to rewrite as follows:

Now, simplify and combine terms:

You can further simplify the left side:

Next, multiply both sides by . This gives you:

← Previous 1
Learning Tools by Varsity Tutors