ISEE Upper Level Math : How to find out if a number is prime

Study concepts, example questions & explanations for ISEE Upper Level Math

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Example Questions

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Example Question #471 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Which of the following is a prime number?

Possible Answers:

Correct answer:

Explanation:

Which of the following is a prime number?

The answer here is 13, because 13 has no factors other than 1 and itself.

51 is divisible by 3 and 17.

39 is divisible by 13 and 3.

81 is divisible by 9, 3, and 27

Example Question #471 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Find the sum of all the prime numbers between  and .

Possible Answers:

Correct answer:

Explanation:

The prime numbers between  and  are , , , and . Their sum is:

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