Answer:
The greatest common factor (GCF) of 378 and 198 is 18.
Explanation:
Find the prime factorization of 378
378 = 2 × 3 × 3 × 3 × 7
Find the prime factorization of 198
198 = 2 × 3 × 3 × 11
To find the GCF, multiply all the prime factors common to both numbers:
Therefore, GCF = 2 × 3 × 3
GCF = 18