In latin it's undecem, meaning 10+1 essentially. duodecem, etc. Until you get to 18... that's duodevigente, which is to say two from twenty, so kinda reversed.

In latin it's undecem, meaning 10+1 essentially. duodecem, etc. Until you get to 18... that's duodevigente, which is to say two from twenty, so kinda reversed. This continues on though for 28-29, etc... 19 is undevigente, 28 is duotrigenta, 29 is untrigenta, etc. Spelling may be off it's been 2-3 decades since I took 4 years of Latin in High School.