There is no such fraction.
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Well, isn't that a happy little question! To write 0.729 as a fraction, we can see that it's equal to 729/1000. Then, to simplify it, we can divide the numerator and denominator by their greatest common factor, which is 9. So, 0.729 as a fraction in simplest form is 81/111.
It is: 0.81 = 81/100 as a fraction
0.162 = 162/1000 or 81/500 in fraction
81% is 81/100 as a fraction in its simplest form
0.81 is a decimal fraction of 81/100 or 81 percent.