The closest number to 5/6 would have to be 1
1) 0 wouldn't be the answer because the fraction would have to look like 0/6, 1/6, or 2/6
2) 1/2 wouldn't be the answer because half of 6 is 3 ---> 3/6
3) 1 would be the answer because 5/6 is close to 6/6, which is one whole.