It is 8/9.
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If both digits are repeating then as a fraction it is 85/99 in its simplest form
.5 repeating in 5/9 in fraction form.
If that is repeating 5 then in fraction form it is 1/18
0.72 repeating written as a fraction in simplest form is 8/11
0.18... repeating is already a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 2/11.