GRE Math : Integers

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #1 : How To Divide Even Numbers

Choose the answer below which best solves the following equation:

Possible Answers:

Correct answer:

Explanation:

To solve this problem, set up long division for yourself.  First, you know that your hundreds digit of the solution will be one, as twelve goes into seventeen one time.  Then, you take twelve away from seventeen, and are left with three remaining.  Bring down your next digit over from the dividend, and you are left with thirty two, which twelve goes into four times.  Already, you know that the answer has to be  as none of the other answers fit the correct pattern.

Example Question #1 : How To Divide Even Numbers

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve, first isolate the variable by dividing both sides of the equation by :

As a check, know that any time you divide an even number by another even number, you will get an even result. 

Example Question #172 : Arithmetic

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve, isolate your variable by dividing both sides of the equation by :

As a check, know that any time you divide an even number by another even number, the result will be even. 

Example Question #173 : Arithmetic

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve, isolate the variable by dividing both sides of the equation by :

As a check, know that any time you divide an even number by another even number, the result will be even.  

Example Question #4 : How To Divide Even Numbers

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve, isolate the variable by dividing both sides of your equation by :

As a check, know that any time you divide an even number by another even number, your result will be even. 

Example Question #1 : How To Divide Even Numbers

Assume  and  are both even whole numbers and .

What is a possible solution of ?

Possible Answers:

Correct answer:

Explanation:

Since , then the final answer will be a number greater than one. The only answer that fits is .

Example Question #1 : Sets

The product of two integers is 14. Which of the following could be the average of the two numbers?  

Possible Answers:

\dpi{100} \small 3.5

\dpi{100} \small 5.5

\dpi{100} \small -5.5

\dpi{100} \small -4.5

\dpi{100} \small -6.5

Correct answer:

\dpi{100} \small -4.5

Explanation:

The two integers in this case, and their respective averages, could be:

 Only \dpi{100} \small -4.5 is one of the answer choices. 

 

Example Question #2 : Sets

Which of these is a natural number?

Possible Answers:

All of these are natural numbers.

None of these are natural numbers .

Correct answer:

Explanation:

The natural numbers are the positive integers (whole numbers) starting with 1. 

Example Question #3 : Sets

Which of the following pairs of events are mutually exclusive?

Possible Answers:

the numbers less than , the numbers greater than

the even numbers, the numbers greater than

the negative numbers,

 for all  values, the numbers greater than

the positive numbers, the numbers less than

Correct answer:

the positive numbers, the numbers less than

Explanation:

We can think of mutually exclusive in terms of a Venn diagram.  We are looking for the pair of events that has nothing in common.  The only sets that don't have a single number in common are the positive numbers and the numbers less than –200. 

Example Question #4 : Sets

In the set of positive, distinct integers , the median is . What is the minimum value of ?

Possible Answers:

Correct answer:

Explanation:

We know that all the numbers are positive, so they are greater than zero.  We also know that the numbers are distinct, so they are all unique.

We can write this as {a + b + 8 + d + e}, so let a and b be 1 and 2 respectively, the smallest possible positive, distinct integers. Then let d and e be 9 and 10, the smallest positive, distinct integers larger than 8.

We add the set {1 + 2 + 8 + 9 + 10} to find it equals 30.

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