What is the GCF of 8 and 18?
GCF (Greatest Common Factor) of the numbers 8 and 18 is the largest possible number which divides 8 and 18 exactly without any remainder.
Answer: GCF of 8 and 18 is 2
Let us see how to find the GCF of 8 and 18
Explanation:
We can find the GCF by the following two methods:

Listing the common factors
Method 1: GCF of 8 and 18 by Listing the Common Factors
Factors of 8: 1, 2, 4, and 8
Factors of 18: 1, 2, 3, 6, 9 and 18
Common factors of 8 and 18 are 1 and 2.
We observe that the greatest common factor of 8 and 18 from the list is 2.
So, GCF of 8 and 18 is 2
Method 2: GCF of 8 and 18 by Prime Factorization
Let us represent 8 and 18 as a product of their prime factors:
Prime factorization of 8 is 2 × 2 × 2
Prime factorization of 18 is 2 × 3 × 3
The common factor in the prime factorization of 8 and 18 is 2
GCF is the product of the factors that are common to each of the given numbers, in this case, it is 2.
You can find the GCF in any of the above methods but the solution will always remain the same.