alt Hacker NewsWith Spanish being similar with distinct words for 11-15 with 16-19 being 10+number. Taking Spanish in high school made me consider that for the first time while never having thought about 11,12 being similar in English until that same thought process.
On_ce, do_ce, tre_ce, cator_ce, quinc_e seem to share similar Latin roots with uno, dos, tres, cuatro, cinco...