1, knot count
Knot counting is one of the recording methods widely used by primitive ancestors. "Yi Ci Xia" documents record: "After the ancient rule, the sage is easy to use calligraphy, rule hundreds of officials and observe the people."
2. Book contract count
Book contract counting is a counting method after the ancient counting and binding method, which is mainly used to count the surplus grain at that time. "Guan Du Zi Pian" records: "There were ropes in ancient times, and then there were easy-to-use books." It is to engrave numbers on animal bones, bamboo, tortoise shells and earth cliffs with a carving knife, which can be preserved for a long time and is not easy to be damaged.
Step 3 count chips
Counting is based on historical records and the discovery of archaeological materials. In ancient times, counting was actually made of bamboo, wood, animal bones and other materials, which was used to count the number of small sticks with similar length and thickness, and kept or carried in small bags when not in use.
The development of ancient numbers
China is one of the four ancient civilizations in the world, and China developed its own mathematical system very early. The Book of Changes records: "Fuxi tied a rope" and "tied a rope in ancient times", and later some sages changed it to a book contract. Among them, there is decimal notation, and the maximum number is 30 thousand.
A complete decimal system appeared in Oracle Bone Inscriptions in Shang Dynasty, which was the earliest used value system. Calculation and compilation are ancient calculation tools in China. Strict calculation has been stereotyped and widely used in the Spring and Autumn Period. Four arithmetic operations have been established in the Spring and Autumn Period, and multiplication operations have been widely popular. Jiujiubiao has been popular for about 1600 years.
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