# Greatest Common Factor of 18 and 42

Greatest common factor (GCF) of 18 and 42 is 6.

GCF(18,42) = 6

We will now calculate the prime factors of 18 and 42, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 18 and 42.

GCF Calculator and

## Prime Factorization of 18

Prime factors of 18 are 2, 3. Prime factorization of 18 in exponential form is:

18 = 21 × 32

## Prime Factorization of 42

Prime factors of 42 are 2, 3, 7. Prime factorization of 42 in exponential form is:

42 = 21 × 31 × 71

### Factors of 18

List of positive integer factors of 18 that divides 18 without a remainder.

1, 2, 3, 6, 9

### Factors of 42

List of positive integer factors of 42 that divides 18 without a remainder.

1, 2, 3, 6, 7, 14, 21

### Greatest Common Factor

We found the factors and prime factorization of 18 and 42. The biggest common factor number is the GCF number.
So the greatest common factor 18 and 42 is 6.

Also check out the Least Common Multiple of 18 and 42