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