There's not any need to make it more practical... Our numbers simply happen to use base 10 while Nahuatl's use base 20. The only problem that arises is when you want to compare them, so 1999 becomes 4.19.19.
I know I already have some good knowledge of the Nahuatl language, and I should have a good answer for this, but the truth is hahaha, that I don't. I'm afraid of numbers in some languages, including Nahuatl, and actually, sadly, Nahua native speakers nowadays usually say quantities in Spanish Except maybe for the first 10 numbers... I hope somebody can help you with this.