@Bella Dea,
I assume you're familiar with Roman numerals, Bella? You know -- I, II,III, IV, V, VII etc, etc. X is ten, C is 100 and so forth, That's just one example of a totally different system, even though it still uses a base-10. What we use today are called Arabic numerals because it was supposedly the Arabs who invented this system and introduced it to the Europeans during the Middle Ages. However, knowing these so-called "Arabic" numerals ain't gonna do ya a bit of good if you're visiting a country where Arabic is the major language. They use an entirely different set of squiggles. I discovered this when I was visiting Damascus, Syria some years ago.