SAT Math : Fractions

Study concepts, example questions & explanations for SAT Math

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Example Questions

Example Question #11 : Fractions

Order the following fractions from least to greatest:

Possible Answers:

Correct answer:

Explanation:

To solve this problem, let's find the least common denominator for our fractions. 

 is the lowest number that each of our current denominators are factors of. 

Now, let's rewrite each fraction so that its denominator is .

Then we can rearrange these new fractions from least to greatest, keeping in mind what they're reduced forms were.

Then, by either simplifying these fractions or by remembering their original forms, we can see that the order of our fractions from least to greatest is:

Example Question #11 : How To Order Fractions From Least To Greatest Or From Greatest To Least

Which of the following fractions is the smallest?

1/3, 115/276, 112/350, 1050/3330, 0.75/2 

Possible Answers:

Correct answer:

Explanation:

1/3, 115/276, 112/350, 1050/3330, 0.75/2 

First you need to put the fractions in ascending order:

1050/3330, 112/350, 1/3, 0.75/2, 115/276

Then choose the fraction with the smallest value (1050/3330).

Example Question #13 : Fractions

Order from greatest to least: 

Possible Answers:

Correct answer:

Explanation:

Rewrite the numbers  in terms of the least common denominator, which is :

Comparing numerators, we see that 

It follows that

and 

,

making this the correct order.

Example Question #14 : Fractions

Order from least to greatest:

Possible Answers:

Correct answer:

Explanation:

Express all three fractions in terms of their least common denominator - the least common multiple of denominators 7, 8, and 12, which is 168. Do this by multiplying the numerator and denominator in each fraction by whatever number yields a product of 168 in the denominator.

it follows that

,

so

Example Question #11 : Fractions

Which of the following five numbers is the greatest?

Possible Answers:

Correct answer:

Explanation:

For each fraction, divide the numerator by the denominator. This is shown below for each fraction to three decimal places:

Division

From the decimal representations,  can be seen to be the greatest of the five choices.

Example Question #16 : Fractions

Solve each problem and decide which is the best of the choices given.

There is a bag with  green marbles,  red marbles,  purple marbles, and  blue marbles. What is the probability that a red marble is randomly chosen from the bag?

Possible Answers:

Correct answer:

Explanation:

To find the probability of a red marble being randomly chosen, you have to divide the number of red marbles by the total number of marbles.

There are  red, and  total,

thus, creating the fraction

.

To find the percentage, simply divide  by  and multiply the result by  to get .

Example Question #17 : Fractions

Determine the approximate percentage given the fraction .

Possible Answers:

Correct answer:

Explanation:

Because a fraction is a part of a whole , set up a proportion.

The fraction  is approximately .

Example Question #18 : Fractions

Bob and Jill go eat dinner at a fancy restaurant. Bob gets lobster and Jill gets crab legs. The lobster cost , and the crab legs cost . If they leave  tip, how much is the combined bill?

Possible Answers:

Correct answer:

Explanation:

To do this, we need to sum up each meal, and then convert the tip into a decimal.

 

Example Question #12 : Fractions

Simplify:  

Possible Answers:

Correct answer:

Explanation:

Rewrite this complex fraction using a division sign.  

Take the reciprocal of the second term and change the division of the division sign.  Simplify.

Example Question #1 : How To Subtract Complex Fractions

Solve:

Possible Answers:

Correct answer:

Explanation:

First reduce the fraction. We can divide both the numerator and the denominator by 3.

 

Now our expression looks like this:

When you add or subtract fractions, you need to have the same denominator. The lowest common deonminator here is 2. So we need to multiply and solve:

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