Answer :

As long as there are no numbers after them the zeros on the right of the decimal don't matter (i.e. 6.3000000=6.3    3.00000=3)
So 81.9=81.90=81.900
Since three of them are the same number there is only one answer left (81.91)
its 81.91 because you can add 0 s to the end of the other numbers and 1 is bigger than 0

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