What is the greatest common factor of 2 12 and 18?

Answer 1

The GCF of 2, 12, and 18 is 2. There are a number of ways to come to this answer.

First, the GCF of a set can't be any bigger than the smallest number in the set. In this case, the GCF can't be bigger than 2. Since 2 is a factor of both 12 and 18, it is the GCF.

You could also find the GCF by writing the prime factorization of each member of the set:

The prime factorization of 2 is 1*2
The prime factorization of 12 is 2*2*3
The prime factorization of 18 is 2*3*3
So the GCF is 2.

Answer 2

• Factors of 12: 1, 2, 3, 4, 6, 12
• Factors of 18: 1, 2, 3, 6, 9, 18
• Factors of 13: 1, 13
• GCF (12, 18, 13) = 1

Answer 3

The GCF of 2, 12, and 18 is 2

Answer 4

The GCF is 6.