College Math CLEP Prep Practice Exam

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What is the greatest common factor of 12 and 18?

  1. 4

  2. 6

  3. 8

  4. 12

The correct answer is: 6

The greatest common factor (GCF) of two numbers is the largest number that divides evenly into both numbers. In this case, both 12 and 18 are divisible by 6, but not by any of the other options listed. A is incorrect because 4 is only a factor of 12, but not of 18. C is incorrect because 8 is a factor of 12, but not of 18. D is incorrect because 12 is a factor of 12, but not of 18. Therefore, the only option that is the GCF of both 12 and 18 is 6.

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