Dix neuf is itself "ten nine", so overall it is "four twenty ten nine" - makes sense in an archaic style, like Roman numerals, where you add or multiply the individual elements of the numbers ie four twenties plus ten and nine or XCIX (one ten from one hundred plus nine).

Easier to just have numbers, but that shit comes from when letters were used to represent numbers, and who wants to write XXXXXXXXXIIIIIIIII for 99?

That doesn't explain why 20s-70s are normal and 80s get weird.

French is a bastardisation of Latin; commoners probably brought around new words for lower numbers that they could actually count to or some shit.

Roman numeral for 99;

I is 1
X is 10
IX is 1 from 10 therefor 9.

C is 100
XC is 10 from 100 therefor 90.

Put it all together, XCIX, and you get 99.

IC? 100-1?

Roman numerals rules don't allow to do that. You shouldn't substract a number from another that is more than 10 times greater (100 > 1*10).

kissmanga.com/Manga/Onepunch-Man/Punch-053?id=256326
Everything after this is new stuff

Yeah fan made, big giveaway is that it reads right to left. And as far as I know these are the only two pages. www.mangabb.co/manga/onepunch-man Pretty sure this has the latest chapters, haven't read the manga so I'm not sure

I don't think that's the part people are concerned about.