Answer:
I think these are right, assuming you can use only one digit
Closest to 0: 1/9
Closest to half: 4/9 or 5/9
Closest to one: 8/9
Step-by-step explanation:
Closest to 0: Numerator of 1, need largest denominator
Closest to half: Largest denominator, numerator close to half of denominator
Closest to one: largest denominator, numerator is denominator minus one