China is the first country in the world to adopt the decimal system. In addition to the unit number, 10, 20, and 30 were found in the cultural relics unearthed in Shaanxi, Shandong, and Shanghai about 4000 years ago, which was more than 1000 years earlier than that in ancient Egypt.
There were four operations in the Yin and Shang Dynasties, and the positive integer multiplication formula "Jiujiuge" was formed in the Spring and Autumn Period and the Warring States Period. Since then, "Nine Jiu Ge" has become one of the foundations for popularizing mathematical knowledge, and it has continued to this day.
In terms of computing tools, the Shang Dynasty invented the "computing chip", which is a small round bamboo stick, and later made of bone and iron. There are two forms: vertical row and horizontal row, and numbers are represented by counting chips. For example, "2" can be expressed as "=" or "II".
According to legend, Pythagorean theorem was discovered by Shang Dynasty's Shang Dynasty, which was more than 500 years earlier than Pythagoras.
China's most famous ancient mathematical works are The Classic of Weekly Parallel Calculations in BC 1 century and Nine Chapters Arithmetic in the Eastern Han Dynasty.
The earliest record of abacus calculation is AD 190. During the Ming and Qing Dynasties, abacus became an indispensable tool in industrial and commercial trade at that time. The abacus is easy to carry, accurate and fast, and it still plays a huge role even now.
During the Three Kingdoms period, Liu Hui used secant method to find pi = 3. 14 16. Zu Chongzhi, a mathematician in the Northern and Southern Dynasties, further refined pi to 3.1415926 ~ 3.1415927.
In the Tang Dynasty, monks and his party established the unequal interval quadratic interpolation method, and Wang Xiaotong got the method to understand the cubic equation. The solution of higher order equation was obtained in Song and Yuan Dynasties. These achievements were in the leading position at that time.