Oh, dude, you're hitting me with the big math questions, huh? So, like, 3.888888888888889 is the same as 3 and 8/9 in fraction form. It's like if you had 3 whole pizzas and almost a full 9th of another one... not bad for a math problem, right?
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If that is a rounded repeating decimal then it is 38/9.
If that is a terminating decimal then it is 3888888888888889/1000000000000000
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.