ISEE Lower Level Math : Operations
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Example Questions
Example Question #111 : Operations
Madeline shares two sandwiches with five of her friends. Including Madeline, how much does each person have to eat?
If Madeline shares two sandwiches with five of her friends, then six people will be sharing two sandwiches.
Therefore each person gets 
Example Question #112 : Operations
What is the greatest common factor of 15 and 10?
The factors of 15 are 1, 15, 3, and 5.
The factors of 10 are 1, 10, 2, and 5.
The common factors that 10 and 15 share are 1 and 5. Thus, 5 is the greatest common factor.
Example Question #113 : Operations
Which of the following is not a factor of 
The product of 
The factors of 36 are 1, 16, 2, 18, 3, 12, 4, 9, 6.
Thus, 8 is the only number listed above that is not a factor of 36.
Example Question #114 : Operations
Maria has 15 cookies. She wants to share the cookies so that she and three friends each get the same number. If she shares the cookies equally, how many cookies will be left over?
None of these
Sharing between Maria and her three friends means that the cookies will be shared between a total of four people.
Divide 15 by 4:
Each person can have 3 cookies, and there will be a remainder of 3. Our answer is that 3 cookies will be left over (the remainder).
Example Question #115 : Operations
Becca has 9 cookies that she is going to give to 3 of her friends in equal amounts. How many cookies does each friend get?
If Becca has 9 cookies that she is going to give to 3 of her friends in equal amounts, then the number of cookies that each friend gets can be found by dividing 9 by 3.
This results in 3, the correct answer.
Example Question #116 : Operations
Lisa has 12 pieces of candy. She gives one third of the candy to her sister and one third to her brother. How many pieces of candy does she have left?
If Lisa has 12 pieces of candy, one third of this amount is 4 pieces.
Since she gives one third of the candy to her sister, her sister must receive 4 pieces. Similarly, her brother will receive four pieces.
We can find the remining amount by subtracting the amount Lisa gives to her siblings from the original number of pieces.
Lisa has four pieces left.
Example Question #117 : Operations
Which of the following is not a prime number?
All of these are prime numbers
A prime number is divisible only by itself and the number 1. In other words, a prime number will only have two factors (itself and 1).
3, 7, and 11 are prime numbers; they cannot be divided by numbers other than themselves and 1.
9, however, can be divided by 3. This gives it more than two factors, and means it cannot be prime.
Example Question #118 : Operations
Which of the following is divisible by 8 but not by 12?
The number 32 is divisible by 8 because 4 times 8 is 32. However, 32 divided by 12 equals 2, remainder of 8. Therefore, 32 is divisible by 8, but not by 12, and is the correct answer.
Example Question #119 : Operations
Betty makes 18 ounces of fruit salad. She puts 2 ounces of fruit salad into smaller containers and then gives them out a club meeting. However, there are only 3 members who attend the meeting. The 3 members take equal numbers of the smaller fruit salads. How many small fruit salads does each member take?
If Betty makes 18 ounces of fruit salad and puts 2 ounces of fruit salad into smaller containers, there will be 
Given that the 3 members each take equal numbers of the small fruit salads, each member will get 
Example Question #120 : Operations
Robert baked 12 cookies for his family to share after dinner. There are 4 members of his family, so everyone should be able to have the same number of cookies. However, his younger brother brought along a friend unexpectedly.
Robert gave 3 cookies to his brother and 3 cookies to his friend. He then equally shared what remained with his 2 parents. How many cookies did Robert get?
After Robert gives 3 cookies to his brother and 3 cookies to his brother's friend, 
If Robert shares the remaining cookies equally with his 2 parents, then Robert and each parent will get 
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