Hello there! Although you might not believe it since I'm going to ask a very very very basic question, I have been using Haskell for educational purposes for a couple semesters now. Nevertheless, I don't think I have ever worked with non-Int number types! :) I don't understand why I get this error. I mean, apparently "/" is not defined for integers but I don't know how to "cast" the result of the length function into a Double... Prelude> (length [1,2]) / 3 <interactive>:1: No instance for (Fractional Int) arising from use of `/' at <interactive>:1 In the definition of `it': it = (length [1, 2]) / 3 Besides, a simple integer division works: Prelude> 2 / 3 0.6666666666666666 But I would guess that's because '2' and '3' are parsed as Floats because they are used in a divide function. Any help will be appreciated! Best regards, - MatÃas