SAT Math : SAT Mathematics

Study concepts, example questions & explanations for SAT Math

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Example Questions

Example Question #5 : How To Order Fractions From Least To Greatest Or From Greatest To Least

Which of the following fractions is less than ?

Possible Answers:

Correct answer:

Explanation:

The purpose of this question is to find understandable values of fractions, which must be done using a common scale. Since looking at the denominators in the answers shows that there are many different numbers, decimal values would be easier to use.

The decimal equivalencies are as follows:

Therefore, we know that  is equal to  and find that the fraction that is less than that is , which is equal to .

 

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

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 : Ordering Fractions

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 #472 : Arithmetic

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 #11 : 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 #12 : Ordering 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 #1 : Fractions And Percentage

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 #2 : Fractions And Percentage

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 #1351 : Sat Mathematics

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 #1 : How To Divide Complex 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.

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