College Math CLEP Prep Practice Exam

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What is the greatest common factor of 12 and 18?

The correct answer is: 6

The greatest common factor, also known as the greatest common divisor, is the largest number that divides evenly into two or more numbers. In other words, it is the largest number that is a common factor of both 12 and 18. In this case, the largest number that both 12 and 18 can be divided by is 6, making 6 the greatest common factor. Option A (3) and Option D (9) are incorrect because they are smaller than 6 and therefore cannot be the greatest common factor. Option C (8) is also incorrect because it does not evenly divide into either 12 or 18, making it an invalid factor for both numbers.