A mixed number can be an integer, a fraction between -1 and 1, or a combination of the two. Since 100 is an integer, it is already written as a mixed number. It just doesn't have a fraction part, only an integer (whole number) part.
It is: 101/100 = 1 and 1/100
It is: 6 and 21/100 as a mixed number
12 37/100
651/100
8 5/100
919/100 = 9 and 19/100 = 9.19
7.79 = 779/100
2 and 47/100
329 55/100
9 and 33/100 ------------------------simplest form
31/100
27 3/100