It isn't that common to need fractions though. Money is typically handled in integer amounts (we just divide the amounts by 100 or whatever to make it easier fo

It isn't that common to need fractions though. Money is typically handled in integer amounts (we just divide the amounts by 100 or whatever to make it easier for humans to grok). Nobody's going to pay half a cent for a latte for example. If for some reason you do need to deal with 1/1000 of a dollar, or 1/10000 of a dollar, you can still use integers. You just need to know the scaling factor. Your presentation layer is probably always going to need to do some manipulation of the number anyway (put a dollar sign on it, etc) so using a decimal amount just for presentation needs isn't a huge win. But it will work too.