SAT Math : Arithmetic

Study concepts, example questions & explanations for SAT Math

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

Example Questions

Example Question #471 : Arithmetic

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 #472 : Arithmetic

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 #473 : Arithmetic

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 #474 : Arithmetic

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 #46 : New Sat Math No Calculator

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.

Example Question #475 : Arithmetic

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:

Example Question #1 : Complex Fractions

Add:  

Possible Answers:

Correct answer:

Explanation:

To add , first simply each term by rewriting the terms using a division sign.

Take the reciprocal of the terms after the division sign, and change the division sign to a multiplication sign. Simplify.

Learning Tools by Varsity Tutors