Poetic Liceanse.Given the fact that they're practically identical to humans, it's possible (albeit incredibly unlikely) that they are another race of humans living in the Delta Quadrant. There are, after all, plenty of isolated human colonies spread out around the galaxy (for starters, ENT: "Terra Nova" and "North Star", VOY: "The 37s" and "Unity"). If that's too hard to believe, maybe the universal translators somehow converted the real numerals into English ones (though it doesn't normally do that).Ummmm.... Hodgkin's Law of Parallel Planetary Development?
More realistically since the audience of Star Trek is primarily American it would make little sense to create a species or script full things no one would understand because it contains a made up number system or language. If no one can understand what's going on no one is going to watch.