High Quality Content by WIKIPEDIA articles! The system of Japanese numerals is the system of number names used in the Japanese language. The Japanese numerals in writing are entirely based on the Chinese numerals and the grouping of large numbers follow the Chinese tradition of grouping by 10,000. Two sets of pronunciations for the numerals exist in Japanese: one is based on Sino-Japanese (on`yomi) readings of the Chinese characters and the other is based on the Japanese yamato kotoba (native words, kun`yomi readings).