Answer:
18 is the greatest common factor of 72 and 54.
Explanation:
We can solve this by finding the prime factorization of 54 and 72.
54: 2 x 3 x 3 x 3
72: 2 x 2 x 2 x 3 x 3
Finding the common number we can see that both numbers have the factorization of 2 x 3 x 3, which would be the greatest common factor. Multiplying 2 x 3 x 3 together we have:
2 x 3 x 3 = 18.
Therefore 18 is the greatest common factor of 72 and 54