First, abacus mental arithmetic

1, the so-called abacus mental arithmetic, namely abacus mental arithmetic. Abacus calculation is a calculation method that uses abacus as a tool to perform operations such as addition, subtraction, multiplication, division and square root. There are certain rules and formulas in its bead-carrying skills. When users can skillfully operate the abacus, they will not only get the correct answer quickly;

2. You can also describe the disk type, level and floating changes of the abacus in your mind. This vivid abacus image is called "virtual disk". It completes abacus calculation in the brain through the process of perception, image and memory, which is what we call abacus mental calculation;

3, abacus mental arithmetic, its speed is amazing. Often, as long as you hear the number of questions or see the calculation questions yourself, the calculator can blurt out the answers or write them out immediately. Therefore, abacus mental center is an advanced computing technology;

Second, the origin

1, "The family of seven children, separated by two lines, is a family of all things. All corners of the country, three religions and nine streams of beads are busy. " ; The word "abacus calculation" was first seen in Xu Yue's Notes on Numerology in Han Dynasty, among which there is a cloud: "abacus calculation controls three talents at four seasons"; After evaluation by UNESCO, abacus was officially listed in the list of intangible cultural heritage of mankind;

2. Bring this ancient invention, which is drifting away from modern society, back to people's field of vision. As an ancient computing tool and skill, it has been with China people for 1800 years. Abacus calculation is a calculation technology based on abacus calculation and mathematical theory, which uses fingers to stir beads and perform operations.

3. It is one of the important inventions of working people in ancient China. For thousands of years, this technology has been spread all over the world and promoted the development of human civilization. Abacus and abacus evolved from "preparation" and "calculation" in ancient China. This is a small bamboo pole. Expressing numbers and calculating them by calculation is called "preparation";

4. From China's earliest astronomical and mathematical work "Zhou Bi suan Jing", we can know that "calculation" has been widely used at least in the Spring and Autumn Period. Archaeologists in China discovered ancient calculation methods from the tombs of Qin and Han Dynasties. According to historical records, the rhyme of abacus appeared in the Southern Song Dynasty, and it has a history of 1800 years.