SAT Math : SAT Mathematics

Study concepts, example questions & explanations for SAT Math

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Example Questions

Example Question #2 : Operations With Fractions

If p is a positive integer, and 4 is the remainder when p-8 is divided by 5, which of the following could be the value of p?

Possible Answers:

20

18

17

19

Correct answer:

17

Explanation:

Remember that if x has a remainder of 4 when divided by 5, x minus 4 must be divisible by 5. We are therefore looking for a number p such that p - 8 - 4 is divisible by 5. The only answer choice that fits this description is 17. 

Example Question #1 : Operations With Fractions

If \dpi{100} \small x=\frac{2}{3} and \dpi{100} \small y= \frac {3}{4}, then what is the value of \dpi{100} \small \frac {x}{y}?

Possible Answers:

\dpi{100} \small \frac{1}{2}

\dpi{100} \small \frac{9}{8}

\dpi{100} \small \frac{5}{7}

\dpi{100} \small 2

\dpi{100} \small \frac{8}{9}

Correct answer:

\dpi{100} \small \frac{8}{9}

Explanation:

Dividing by a number (in this case \dpi{100} \small \frac {3}{4}) is equivalent to multiplying by its reciprocal (in this case \dpi{100} \small \frac {4}{3}).  Therefore:

\dpi{100} \small \frac {2}{3}\div \frac{3}{4} = \frac{2}{3}\times \frac{4}{3} = \frac{8}{9}

Example Question #1491 : Sat Mathematics

Evaluate the following:

Possible Answers:

None of the available answers

\frac{507}{400}

\frac{400}{507}

\frac{25}{507}

\frac{4}{5}

Correct answer:

\frac{400}{507}

Explanation:

First we will evaluate the terms in the parentheses:

Next, we will square the first fraction:

\frac{100}{169}\div \frac{3}{4}

We can evaluate the division as such:

\frac{100}{169}\times\frac{4}{3}=\frac{400}{507}

Example Question #5 : How To Divide Fractions

Evaluate the expression:

Possible Answers:

Correct answer:

Explanation:

When dividing fractions, you invert the second term and multiply the numbers. 

 

You can reduce the numbers that are diagonal from each other to make the numbers smaller and easier to multiply. 

Example Question #1 : How To Divide Fractions

Simplify

Possible Answers:

Fractions with variables cannot be divided

Correct answer:

Explanation:

When you dividing fractions, multiply by the reciprocal of the denominator.

Example Question #11 : Operations With Fractions

Which fraction has a value greater than that of X?

Possible Answers:

Correct answer:

Explanation:

First, start by putting changing the fractions in the equation so that they have the same denominator.

Then, you can easily subtract the numerators. The denominator stays the same at this point:

At this point, you can reduce the fraction by dividing the numerator and the denominator by :

Then, to easily compare the fraction to the answer choices, you can change the fraction to a decimal:

By changing the answer choices to decimals as well, you can easily figure out which value is greater than :

, so  is the correct answer.

Example Question #37 : New Sat Math Calculator

Jesse has a large movie collection containing X movies. 1/3 of his movies are action movies, 3/5 of the remainder are comedies, and the rest are historical movies. How many historical movies does Jesse own?

Possible Answers:

(7/12)*X

(4/15)*X

(3/9)*X

(11/15)*X

(2/5)*X

Correct answer:

(4/15)*X

Explanation:

1/3 of the movies are action movies. 3/5 of 2/3 of the movies are comedies, or (3/5)*(2/3), or 6/15. Combining the comedies and the action movies (1/3 or 5/15), we get 11/15 of the movies being either action or comedy. Thus, 4/15 of the movies remain and all of them have to be historical.

Example Question #13 : Operations With Fractions

If x = 1/3 and y = 1/2, find the value of 2x + 3y.

Possible Answers:

5/6

13/6

6/5

1

2

Correct answer:

13/6

Explanation:

Substitute the values of x and y into the given expression:

2(1/3) + 3(1/2)

= 2/3 + 3/2

= 4/6 + 9/6

= 13/6

Example Question #131 : Arithmetic

Alternating1

Possible Answers:

\dpi{100} -\frac{47}{60}

\dpi{100} \frac{47}{60}

\dpi{100} \frac{17}{60}

\dpi{100} \frac{43}{60}

\dpi{100} -\frac{43}{60}

Correct answer:

\dpi{100} \frac{47}{60}

Explanation:

Alternating2

Alternating3

Example Question #1492 : Sat Mathematics

What is the solution, reduced to its simplest form, for x = \frac{7}{9}+\frac{3}{5}+\frac{2}{15}+\frac{7}{45}} ?

Possible Answers:

x = \frac{75}{45}

x = \frac{115}{45}

x = \frac{7}{15}

x =2

x = \frac{5}{3}

Correct answer:

x = \frac{5}{3}

Explanation:

x=\frac{7}{9}+\frac{3}{5}+\frac{2}{15}+\frac{7}{45}=\frac{35}{45}+\frac{27}{45}+\frac{6}{45}+\frac{7}{45}=\frac{75}{45}=\frac{5}{3}

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