GRE Math : How to divide integers
Study concepts, example questions & explanations for GRE Math
All GRE Math Resources
Example Questions
Example Question #1 : How To Divide Integers
Apples are sold by whole bushels. You cannot purchase part of a bushel. There are 126 apples in a bushel.
Sam is a caterer who needs to bake 300 pies to sell at the county fair. If it takes 4 apples to make a pie, how many bushels must Sam order to ensure he has enough apples for his pies?
10
11
12
9.5
9
10
Because Sam needs to make 300 pies, and each pie needs 4 apples, the number of apples he needs is
300 x 4 = 1200.
To determine how many bushels Sam needs, divide the total number of apples by the number of apples sold in a bushel.
1200 / 126 = 9.524
Because apples are sold by the whole bushel, Sam cannot order part of a bushel. In order to make sure he has sufficient apples, he will need to order 10 bushels.
Example Question #2 : How To Divide Integers
Which of the following integers is divisible by ?
In order to find a number divisible by 6, you must find a number divisible by both of its factors — 2 and 3. Only even numbers are divisible by 2, so 81 is eliminated. In order to be divisible by 3, the sum of the digits has to be divisible by 3.
The sum of the digits of 316 is 3 + 1 + 6 = 10.
For 240, the sum is 2 + 4 = 6.
For 118, the sum is 1 + 1 + 8 = 10.
Only 6 is divisible by 3.
Example Question #132 : Integers
Which of the following rules makes the expression an integer?
All of these rules make an integer.
divided by has a remainder of
divided by has a remainder of
None of these rules makes an integer.
is a multiple of
divided by has a remainder of
4 is already an integer, so we need to make sure x/10 is an integer too.
Multiples of 5 won't work. For example, 5 is a multiple of 5 but 5/10 isn't an integer. Similarly, if x/10 leaves a remainder of 5, x/10 isn't an integer. For example, 15/10 leaves a remainder of 5 and isn't an integer.
If x/10 has no remainder, then it must be an integer. For example, 10/10 and 20/10 both leave no remainders and simplify to the integers 1 and 2, respectively.
Example Question #13 : Operations
The remainder of is .
Quantity A:
Quantity B:
Quantity A is larger.
The two quantities are equal.
The relationship between the two quantities cannot be determined.
Quantity B is larger.
The relationship between the two quantities cannot be determined.
If the remainder of is , we know that could be:
Since this generates an entire list of values, we cannot know which quantity is larger.
Do not be tricked by the question, which is trying to get you to say that they are equal!
Example Question #12 : Operations
The remainder of is .
The remainder of is .
Which of the following is a potential value for ?
Begin by writing out a few possible values for and .
Since the remainder of is , we can list:
Since the remainder of is , we can list:
Since (which is ) is your smallest possible value, you know that and are not options. You cannot derive either or from the values given.
Therefore, the only option that is left is , which is equal to .
All GRE Math Resources
