This is a simple question and I'd appreciate a simple answer. ;-) So, 2/3 is .6666... Is it a repeating decimal like this only in base 10 decimal system? Is this just an artifact of using base 10? It's still rational, even though you can't write it out? What is the standard notation for this type of thing? 10/11 is another example. Is this just due to the base 10? If so, are there repeaters that repeat independently of the number system you are using? Or is this kind of "weird" behavior number system specific? Thanks.