If the 2 repeats indefinitely, then it is 2/9. Solve like this:
If you had a pair of repeating digits, then multiply by 100, or in general, if you had n repeating digits, multiply by 10^n. Example: if you had y = 0.090909..., then 100y = 9.090909..., then 99y = 9, and y=1/11.
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0.0175 is 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 175/10000. You can simplify this rational fraction if required.
0.16666 in fraction form = 8333/50000
-0.083 In fraction form = -83/1000
-4.16 in fraction form = -104/25
0.3149 is 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 3149/10000.