16
The greatest common denominator is infinite.
4
32 is the LCD of 8, 16, and 32
48
48
1232
It is: 80
48
LCD(13, 16, 8) = 208
16 is the answer you're looking for. If you have two fractions with denominators of 8 & 16, then 16 is the Least Common Multiple of the two denominators.
It is: 1008