ISEE Upper Level Quantitative : How to find out if a number is prime
Study concepts, example questions & explanations for ISEE Upper Level Quantitative
All ISEE Upper Level Quantitative Resources
Example Questions
Example Question #21 : Prime Numbers
Which one is greater?
it is not possible to tell based on the information given.
A prime number is a natural number greater than 
So their product is:
Example Question #71 : Factors / Multiples
Which one is greater?
it is not possible to tell based on the information given.
A prime number is a natural number greater than 
So their product is:
Example Question #21 : Prime Numbers
Which one is greater?
it is not possible to tell based on the information given.
A prime number is a natural number greater than
The prime numbers between 
The prime numbers between 
So 
Example Question #71 : Factors / Multiples
Which is the greater quantity?
(A) The sum of the even integers from 21 to 30 inclusive
(B) Three times the sum of the prime integers from 21 to 30 inclusive
It is impossible to determine which is greater from the information given
(A) and (B) are equal
(A) is greater
(B) is greater
(B) is greater
The even integers from 21 to 30 inclusive are 22, 24, 26, 28, and 30; their sum is
The prime integers from 21 to 30 inclusive are 23 and 29. their sum is
and three times this sum is
This makes (B) greater
Example Question #72 : Factors / Multiples
What is the sum of the prime integers between 75 and 100?
The prime integers between 75 and 100 are
Their sum is
Example Question #21 : Prime Numbers
Which is the greater quantity?
(A) The number of composite integers between 41 and 50 inclusive.
(B) The number of prime integers between 41 and 50 inclusive.
(A) is greater
(A) and (B) are equal
(B) is greater
It is impossible to determine which is greater from the information given
(A) is greater
The only prime numbers among the ten in the range 41 through 50 are 41, 43, and 47; this makes three prime numbers and seven composite numbers, so (A) is greater.
Example Question #74 : Factors / Multiples
Multiply the least and greatest primes between 80 and 100.
The least and greatest primes between 80 and 100 are 83 and 97; their product is
Example Question #75 : Factors / Multiples
Which of the following is the greater quantity?
(A) The sum of the prime numbers between 80 and 90
(B) The sum of the prime numbers between 90 and 100
(B) is greater
(A) and (B) are equal
(A) is greater
It is impossible to determine which is greater from the information given
(A) is greater
The prime numbers between 80 and 90 are 83 and 89, whose sum is 
Example Question #81 : Factors / Multiples
Which is the greater quantity?
(A) Twice the number of prime numbers between 41 and 50 inclusive
(B) The number of composite numbers between 41 and 50 inclusive
It is impossible to determine which is greater from the information given
(B) is greater
(A) is greater
(A) and (B) are equal
(B) is greater
Out of the ten integers from 41 to 50, the prime numbers are 41, 43, and 47 - therefore, there are three prime numbers and seven composite numbers. Since
(B) is greater.
Example Question #82 : Factors / Multiples
Which of the following is the greater quantity?
(A) The sum of the prime numbers between 50 and 60
(B) The sum of the odd composite numbers between 50 and 60
(A) is greater
(A) and (B) are equal
(B) is greater
It is impossible to determine which is greater from the information given
(B) is greater
The prime numbers between 50 and 60 are 53 and 59; their sum is 
All ISEE Upper Level Quantitative Resources
