Answer:
5
Explanation:
The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.
The factors of 5 are 1 and 5.
The largest number that appears in both lists is 5. So, the greatest common factor of 30 and 5 is 5. It's the magic number that both 30 and 5 can evenly dance to.