Yeah, expressing that you are talking about the, eh, Arabic numbers in Arabic in a generally understandable way is pretty hard haha
I don't think Arabic numbers are necessarily the hardest of all, but coming from English, they are certainly tougher than, say, Spanish: The numerals are different, and so is the script in the long-form. It's "one-twenty" instead of "twenty-one" so to speak. And counting to 10 already requires quite a few of the really hard, uniquely Arabic sounds, like the 'ain. So yeah, not trivial :D
You can certainly learn them without this project, but you definitely have to seriously practice in some way..