What I thought of is this. In French, I think, you just stick ‘ieme’ after virtually every number. Premier, deuxieme, troisieme, quatrieme etc. (I’ve given up on accents!)
But I thought (because I have to before I know what to do): it’s 20th, 21st, 22nd, 23rd, before going back to 24th! That’s 4 different endings! And people always get them right. WTF? How did English ever get so widely spoken?