Why most languages use special names for the numbers 11 to 19?

Question

For example, some languages follow the same rule regardless if its in 10s or 20s:

Japanese | Chinese |
Juu-ni | Shi er | twelve
Ni-juu-ni | Er shi er | twenty two

But other languages such as:

English | French | Romanian | Icelandic | German | Philipino |

Twelve | douze | doisprezece (two towards ten wtf) | tólf | zwölf | labindalawa
Twenty two | vingt-deux | Douăzeci și doi (two tens and two) | tuttugu og tveir | zweiundzwanzig (two and twenty) | dalawampu’t dalawa

Initially I thought it was an european thing but not even koreans do it like japanese or chinese people, so why is that?

In: 38

Answer 1

It also comes back from days of old when base 10 numbering wasnt the standard.

Base 12 has an advantage that it is divisible by 2,3,4,6

So stands to reason you have a word for 1 to 12