GRE Math : How to factor a number

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #671 : Gre Quantitative Reasoning

The product of two distinct integers is . Which of the following is a possible sum of these two integers?

Possible Answers:

Correct answer:

Explanation:

Since  is negative, it is the product of a positive and negative integer. Consider all of the ways that it could be factored, and the sums these factors would produce:

 is the answer choice that matches.

 

Example Question #94 : Arithmetic

The prime factorization of 60 is?

Possible Answers:

2 * 2 * 3 * 5

2 * 3 * 5

2 * 3 * 10

2 * 3 * 3 * 5

Correct answer:

2 * 2 * 3 * 5

Explanation:

Prime numbers are numbers that can only divided by one and themselves.  Breaking 60 into its prime factors yields:

Gre_quant_171_02

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