The so-called abacus mental arithmetic is 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 the skill of transporting beads. When the user can skillfully operate the abacus, he can not only get the correct answer quickly, but also describe the disk type, grade and floating change of the abacus in his mind through the growth of brain cells. 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.

The speed of mental arithmetic 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.

The origin of abacus mental arithmetic

Abacus mental arithmetic is an activity to calculate numbers through thinking and get results. It is a calculation in the brain by using the abacus representation as the carrier and the abacus rules. Since humans began to have the concepts of numbers and numbers, and can calculate the simplest numbers, there has been mental arithmetic. In order to assist mental arithmetic, the calculation tool of "taking things near and taking things far" appeared, and stones, branches and so on are also the most primitive calculation tools for taking things far. Then, the calculation tools and corresponding algorithms such as calculation, abacus calculation, pen calculation and computer calculation were invented.

Extended reading:

Fast calculation method

Fast calculation method of historical harvest;

The quick calculation method invented by Shi Fengshou, a master of quick calculation, has been studied for 10 years, which is a method of calculating directly with the brain, also called quick mental arithmetic, quick mental arithmetic. This method breaks the traditional method of counting from the low position for thousands of years, and summarizes 26 formulas by using the carry rule. Counting from the high position and counting with the help of fingers can speed up the calculation, which can instantly calculate the correct results, help human beings develop their brain power and strengthen their ability to think, analyze, judge and solve problems. It is a great pioneering work of contemporary applied mathematics. [2]

This set of calculation method, officially named "Fast Algorithm of Historical Harvest" by the state in 1990, has been incorporated into the mathematics textbook of modern primary schools in China's nine-year compulsory education. UNESCO called it a miracle of educational science, which should be spread to the whole world. [2]

The main functions of the historical harvest speed algorithm are as follows:

1, from high position, from left to right;

2. There is no calculation tool;

3. There is no calculation program;

4. See that the formula directly quotes the correct answer;

5. It can be used for addition, subtraction, multiplication and division of multi-bit data and mathematical operations such as multiplication, square root, trigonometric function and logarithm.