I was working on question 33 of Project Euler in python when I noticed something I do not understand. The answer to the question needed the denominator given in its lowest common terms so I thought I would use the float.as_integer_ratio() to check what the denominator was. It turns out that 0.01.as_integer_ratio() returns (5764607523034235, 576460752303423488) and 0.1.as_integer_ratio() returns (3602879701896397, 36028797018963968) instead of the expected 1/100 and 1/10. Why does it behave like this? I am guessing it has something to do with how these numbers are stored on the computer. I have also tried the Fractions library from python but this gives the same results. I hope someone can explain why it behaves like this to me.