Is China abacus an intangible cultural heritage?

China abacus is an intangible cultural heritage.

With the development of the times, abacus culture extends to every corner of life. Abacus has a long history, and China people have always insisted on protecting, inheriting and developing this skill and promoting abacus mental arithmetic culture. Jingwei Sancai is the great creation of working people in ancient China. According to the existing historical records, the earliest round bead used for calculation was Tao Wan in the Western Zhou Dynasty.

Therefore, the bud of abacus can be traced back to the Shang and Zhou dynasties more than 3000 years ago. As the old saying goes, yunzhu's accounts are clear, and the balance of payments is in line with the dragon. The abacus is regarded as the "fifth invention" made by China in the history of world civilization, and is called the "oldest computer". The name of abacus calculation first appeared in 1800 years ago in Xu Yue's Arithmetic Notes in Han Dynasty. In the Riverside Scene of Qingming Festival in Song Dynasty, it can be clearly seen that there is an abacus on the counter of Zhao Taicheng's drugstore.

The structure of the abacus:

1, bead arrangement: the beads on the abacus are arranged from right to left, with the rightmost digit and the leftmost ten digits. There is a counting bead on each gear to indicate the value.

2. Finger usage: When using the abacus, you usually dial the abacus with your right hand and control the gear with your left hand. Thumb, forefinger and middle finger are the main fingers of pulling beads, and other fingers play an auxiliary role.

3. multiplication formula: multiplication formula is the basis of multiplication operation, and the multiplication formula in abacus calculation is slightly different from that in mathematics. The abacus multiplication formula transforms multiplication operation into addition and shift operation according to the principle of value system.

4. Division formula: Division formula is the basis of division operation, and the division formula in abacus calculation is slightly different from that in mathematics. The abacus mental arithmetic division formula determines the range of quotient according to the digits of quotient and the position of mantissa, and determines the range of mantissa according to the digits of divisor and the position of mantissa.