The Bible, for example, uses fractions. In Lev. 5:16 - "He must make restitution for what he has failed to do in regard to the holy things, add a fifth of the value to that and give it all to the priest, who will make atonement for him with the ram as a guilt offering, and he will be forgiven."
This is a quote from this link: http://news.ycombinator.com/item?id=4995215
(I haven't hotlinked it because there's a cuss word in the thread title. I know that many people don't care, but I'm trying to be polite in a forum where I'm not quite sure of the boundaries.)
I'm not sure what version of the Bible this comes from. But what kind of fractions are used in the texts - are they this simple? "add a fifth of the value"?