812 is an integer and there is no simpler form.
If you mean 8/12 then it is 2/3 simplified
812 is an integer and not a fraction. There is no sensible way to express it as a fraction.
It is 812/1
812/100
812 is an integer, not a fraction. There is not really a sensible way of writing it as a fraction. However, if you must, you can use (812*k)/k where k is any non-zero integer as an equivalent fraction.
81.2 = 812/10 or 406/5 in fraction
It is 812/1.
It is 3 and 812/1000. This can be simplified if you so wish.
2/3
812/100 or 203/25
x.xxx 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. And, since it is a decimal fraction, there is not another simpler decimal form. So that could be your answer. Its equivalent, in rational form, is 812/1000 which simplifies to 203/250.
Simplest form