Fractions of time would probably be full of fail, since it uses a different scale since it's time. Try to think of an example using video games, maybe some RPG

Fractions of time would probably be full of fail, since it uses a different scale since it's time. Try to think of an example using video games, maybe some RPGs use three decimal places somewhere for stats. Somehow as a civilization we must have decided somewhere that 2 fixed floating point places was plenty for 99% of things, because you usually never see any more than that unless you get into science. Another possible way would be to show percentages, but that might also complicate things if they don't know about them yet.