In the "Engishiki" system of the Daigaku-ryo, among the nine small scripture textbooks of Sando (Mathematics), which included "Sonshi Sankyo," "Goso Sankyo," "Kyusho Sanjutsu," "Kaito Sankei," "Rokusho," "Teijutsu," "Sankai Jusa," "Shuhi Sankei," "Kyushi," three were compulsory, "Kyusho Sanjutsu," "Rokusho," and "Teijutsu" with "Shuhi Sankei" added later to the compulsory list of textbooks.
また、算道は『孫子算経』・『五曹算経』・『九章算術』・『海島算経』・『六章』・『綴術』・『三開重差』・『周髀算経』・『九司』の9書を教科書としていた『延喜式』大学寮式では全て小経に区別されているが、『九章算術』・『六章』・『綴術』が必修とされており、後に『周髀算経』がこれに準じるものとされている。