Nah, eleven and twelve not having a -teen suffix is because English doesn’t have any standards and steals language randomly. Both are germanic in origin, but different time periods. Eleven and twelve come from a 12th century system of counting on your fingers (twelve basically means ‘two left’ after you count to ten), and -teen is from a 14th century math perspective (thirteen basically means ‘ten more than three’).
Nah, eleven and twelve not having a -teen suffix is because English doesn’t have any standards and steals language randomly. Both are germanic in origin, but different time periods. Eleven and twelve come from a 12th century system of counting on your fingers (twelve basically means ‘two left’ after you count to ten), and -teen is from a 14th century math perspective (thirteen basically means ‘ten more than three’).