What is the greatest common factor of 30 and 45?

The greatest common factor (GCF) of two numbers is the largest number that divides both of them without leaving a remainder.

To find the GCF of 30 and 45, we can list the factors of each number:

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30 Factors of 45: 1, 3, 5, 9, 15, 45

From the lists above, we can see that the largest number that both 30 and 45 can be divided by is 15. Therefore, the GCF of 30 and 45 is 15.