15 is a factor of 60.
The proof: 15 x 4=60
(It is, of course, not a prime factor.)
Because 45 is not a factor of 60, whereas 15 and 30 are.
15+15+15+15=60
Yes.
60 mph
It can be. 60 is a factor of 120.
The greatest factor of a number is the number itself. So, the greatest factor of 60 is 60.
15,15,3
(15,1)(5,3)
60
25
60
No, 120 is a multiple of 60. 60 is a factor of 120.