▁and ▁German ), ▁the ▁names ▁of ▁the ▁two - digit ▁numbers ▁from ▁ 1 1 ▁to ▁ 1 9 ▁consist ▁of ▁one ▁word , ▁but ▁the ▁names ▁of ▁the ▁two - digit ▁numbers ▁from ▁ 2 1 ▁on ▁consist ▁of ▁two ▁words . ▁So ▁for ▁example , ▁the ▁English ▁words ▁eleven ▁( 1 1 ), ▁twelve ▁( 1 2 ), ▁th ir teen ▁( 1 3 ) ▁etc ., ▁as ▁opposed ▁to ▁twenty - one ▁( 2 1 ), ▁twenty - two ▁( 2 2 ), ▁twenty - three ▁( 2 3 ), ▁etc . ▁In ▁French , ▁this ▁is ▁true ▁up ▁to ▁ 1 6 . ▁In ▁a ▁number ▁of ▁other ▁languages ▁( such ▁as ▁Heb rew ), ▁the ▁names ▁of ▁the ▁numbers ▁from ▁ 1 1 - 1 9 ▁contain ▁two ▁words , ▁but ▁one ▁of ▁these ▁words ▁is ▁a ▁special ▁" teen " ▁form , ▁which ▁is ▁different ▁from ▁the ▁ordinary ▁form ▁of ▁the ▁word ▁for ▁the ▁number ▁ 1 0 , ▁and ▁it ▁may ▁in ▁fact ▁be ▁only ▁found ▁in ▁these ▁names ▁of ▁the ▁numbers ▁ 1 1 - 1 9 . ▁ ▁C anton ese ▁and ▁Wu ▁Chinese ▁frequently ▁use ▁the ▁single ▁unit ▁ ▁( C anton ese ▁y à h , ▁Shang h ain ese ▁ny ae ▁or ▁ne , ▁Mand arin ▁ni àn ) ▁for ▁twenty , ▁in ▁addition ▁to ▁the ▁fully ▁decimal ▁ ▁( C anton ese ▁y ì h ▁s à hp , ▁Shang h ain ese ▁el ▁sah , ▁Mand arin ▁è r