Did you mean 12 1/3? If you didn't, my apologies. Reply if you meant something else :)
ANSWER: 12.3333333333 (repeating decimal)
First, convert 12 1/3 into an improper fraction.
1. 12*3=36
2. 36+1=37
answer: 37 / 3
Then, simply divide 37/3 (You can easily do it with this website's home page).
= 12.333333333
The answer is a repeating decimal; it goes on and on forever