Answer:
The answer is 3
Explanation:
The GCF of 12 and 45 is 3. To calculate the greatest common factor of 12 and 45, we need to factor each number (factors of 12 = 1, 2, 3, 4, 6, 12; factors of 45 = 1, 3, 5, 9, 15, 45) and choose the greatest factor that exactly divides both 12 and 45, i.e., 3.