812.5 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 8125/10 which can be simplified. But simplification could mean that you could lose information about the precision of the fraction.
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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 equivalent, in rational form, is 8125/10000. You can simplify this rational fraction if required.
81/8 = 8125/1000 or 65/8
Well, honey, there are 8125 whole numbers in 8125. It's right there in the name - "whole numbers." No need to overcomplicate things, darling.
8.125 = 8125/1000 and 65/8. It simplifies to: 81/8
81.25 x (10/10) = 812.5/10 x (10/10) = 8125/100 If you want to simplify: 8125/100 = 1625/20 = 325/4