The greatest common factor of 15, 12, and 24 is 3, since



Therefore, there is no number greater than 3 that is a common divisor of 15, 12 and 24.
If we divide 15, 12 and 24 by 3 we get:



The greatest common factor of 5,4, and 8 is I, since there is no number greater than I that is a factor of 15, 12, and 24.
So, let's observe that the result is
