No. 8.125 is bigger than 8.1 is.
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0.8125 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 rational equivalent is 8125/10000 which can be simplified, if required. However, simplification will result in a loss of information about the accuracy of the number.
1, 3, 9, 27, 81. 1 x 81 = 81, 3 x 27 = 81, 9 x 9 = 81.
The factors of 81 are 1, 3, 9, 27, and 81.
81% is 81/100 as a fraction in its simplest form
81 has 5 factors: 1, 3, 9, 27, and 81.