Well quatre-vignt-dix is literally translated to “four twenty ten”.

But when a french person hears that, they don’t hear those numbers, to them it just means ninety.

Just like an english person won’t hear. “four-ty”, and think “four-ten” “oh that’s 40”. Because “fourty” was originally “four-ten” (written differently because old english so I rewrote in modern for simplicity) and got shortened down.

To them “fourty” is just a word that means 40. Just like to metropolitan french people “ quatre-vignt-dix” is just a word that means 90.