A pattern you might notice is that words containing a ١ or ٢ have word-forms that differ from any patterns Comparison of Arabic numerals [edit ... ٠: ١: ٢: ٣: ... Numbers ending with ٠, also known as tens in English, are formed methodically by replacing ـة- with ـون-; the numbers ١٠ and ٢٠ have special forms ...