Let's note that this fall apart in Metropolitan French, where we don't say neither « septante » for 70, nor « nonante » for 90 (and even less « huitante » for 80), but « soixante-dix » for 70, « quatre-vingt » for 80 and « quatre-vingt-dix » for 90.
It's quite a shame, because that solution for reading hexadecimal numbers out loud is quite elegant :)