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The GCF of 15 and 18 is 3. The easiest way to find the answer is to notice that the difference between 15 and 18 is 3. The GCF of a pair of numbers can't be any greater than its difference. Since we can see that 3 is a factor of both 15 and 18, it is clearly the GCF.
Another way to find the answer is to write the prime factorizations of each number in the set.
The prime factorization of 15 is 3*5
The prime factorization of 18 is 2*3*3
So the GCF of 15 and 18 is 3.
The greatest common factor of 15 and 18 is 3.
3 x 5 = 15
3 x 6 = 18
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