Yes, the greatest common factor of 16 and 42 can be and is less than 16. The GCF of 16 and 42 is 2..
It can be and it is.
It can and is.
It can be and is.
It isn't.
It can be and is.
Since 16 is not a factor of 40, the GCF must be less than 16.
Greatest common factor of 16 and 16 is 16.
The greatest common factor of 96 , 16 = 16
6
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
The greatest common factor of 16 , 58 = 2
The greatest common factor for 16 and 38 is 2.