The common multiples of 8 and 12 that are between 1 and 100 are 22, 44, 66 and 88.
60.
The common multiples of 1 and 100 are any multiple of 100.
Just 60.
Just 60.
Just 60.
60 is the only one
60 is the only one.
Just 60.
Just 60.
Just 60.
The common multiples of a number with itself are the multiples of that number. Thus all multiples of A between 1 and 100 are the common multiples of A and A between 1 and 100.