Factoring and Multiples

# What is the greatest common factor of 8 and 18?

###### Wiki User

###### 2016-04-02 14:02:44

The GCF of 8 and 18 is 2.

The factors of 8 are 1, 2, 4, and 8.

The factors of 18 are 1, 2, 3, 6, 9, and 18.

The common factors are 1 and 2, so 2 is the greatest common

factor.

You can also look at the prime factors to determine the GCF.

The prime factors of 8 are 2, 2, and 2.

The prime factors of 18 are 2, 3, and 3.

The prime factors in common are a single 2, so the greatest

common factor is 2.