Ace That College Math CLEP Test 2025 – Crunch Numbers and Conquer!

Question: 1 / 400

What is the greatest common factor of 18 and 21?

1

3

The greatest common factor (GCF) of two numbers is the largest positive integer that divides both numbers without leaving a remainder.

In this case, the GCF of 18 and 21 is 3, which means that 3 is the largest number that can evenly divide into both 18 and 21.

Option A (1) is incorrect because 1 can divide into any number without leaving a remainder, not just into 18 and 21.

Option C (6) and D (9) are not the GCF because they are not the largest numbers that can evenly divide into both 18 and 21.

Therefore, the correct answer is B (3).

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