What textbooks were there in the Tang Dynasty?
In the early Tang Dynasty, due to the need of teaching, 65,438 arithmetic books were annotated and approved by scientists such as Li, which were called the top ten arithmetic classics in the history of mathematics, namely, Nine Chapters of Arithmetic, Calculation Classics on the Island, Calculation Classics by Sun Tzu, Calculation Classics by Zhang Qiu and Calculation Classics by Zhou Yun.