Answer:
10
The GCF of 30 and 100 is 10. To calculate the greatest common factor of 30 and 100, we need to factor each number (factors of 30 = 1, 2, 3, 5, 6, 10, 15, 30; factors of 100 = 1, 2, 4, 5, 10, 20, 25, 50, 100) and choose the greatest factor that exactly divides both 30 and 100, i.e., 10
