Latin has 1 to 10 as quite reasonable. 11 is "undecim" (one ten), and 12 is "duodecim" (two ten)... 16 is "sedecim" (six ten), 17 is "septendecim" (seven ten).

Latin has 1 to 10 as quite reasonable. 11 is "undecim" (one ten), and 12 is "duodecim" (two ten)... 16 is "sedecim" (six ten), 17 is "septendecim" (seven ten)... 18 is duodeviginti (two from twenty) and 19 is undeviginti (one from twenty). https://en.wikipedia.org/wiki/Latin_numerals https://en.wikipedia.org/wiki/Latin_numerals