Decimal decimals are expressed by small characters attached to integer digits, which is the earliest decimal representation in the history of mathematics. Decimal decimal system is one of the three great inventions based on calculation in the history of modern mathematics. Liu Hui (about 225-295), a native of Zouping, Binzhou, Shandong Province, was a great mathematician in Wei and Jin Dynasties and one of the founders of China's classical mathematical theory.

He has made great contributions to the history of Chinese mathematics, and his masterpieces "Nine Chapters of Arithmetic Notes" and "Arithmetic on the Island" are the most precious mathematical heritages of China. Liu Hui has quick thinking and flexible methods. He advocates reasoning and intuition. He was the first person in China who explicitly advocated using logical reasoning to demonstrate mathematical propositions. Liu Hui's life is a life of hard exploration of mathematics.

Although his position is low, his personality is noble. He is not a mediocre man who seeks fame and fame, but a great man who never tires of learning. He left us a valuable fortune. In May, 20021,the International Astronomical Union (IAU) approved the naming of the lunar landforms in China near the landing site of Chang 'e V, and Liu Hui is one of the eight landforms.

His masterpiece Notes on Nine Chapters Arithmetic is the annotation of Nine Chapters Arithmetic. Nine Chapters Arithmetic is one of the oldest mathematical monographs in China, which was written in the Western Han Dynasty. The completion of this book has gone through a historical process. Some of the mathematical problems collected in the book were circulated in the pre-Qin period and have been deleted and revised by many people for a long time.

Development history:

The appearance of decimals is a great event in the history of mathematics. Capolli, an American mathematical historian, boiled Cao into decimals, which is one of the three great inventions on the basis of needle calculation in modern mathematical history. The abnormal force of modern Shu calculation is due to the three inventions of Indian Shu number method, decimal and logarithm, so it is beneficial to introduce the development history of decimal.

In the history of western mathematics, the invention of decimals is often attributed to Europeans, especially Stevin and others, which is incorrect. In fact, before Europeans, China, India and Central Asia all used decimals.