A couple of suggestions: functions like rem look better infix: x `rem` 3 this means the same thing but is more readable (I think). Instead of folding, j

A couple of suggestions: functions like rem look better infix: x `rem` 3 this means the same thing but is more readable (I think). Instead of folding, just map putStrLn over the list: mapM_ (putStrLn . show') [1..100] mapM_ is just a version of map for monads that ignores its result (it returns m () instead of m a). You can also use forM_ which is mapM_ with its arguments reversed. Finally, I think this site lets you format code by putting four spaces in front of each line. I hope :) Edit: One other thing. You don't need all those parentheses in the first line. rem x 3 == 0 && rem x 5 == 0 = "FizzBuzz" x `rem` 3 == 0 && x `rem` 5 == 0 = "FizzBuzz" Both versions should work and I think they are easier to read. I could see (rem x 3 == 0) also being clear, but the outermost parentheses do not help at all.