Historical Harvest Speed Algorithm: a quick calculation method invented by Shi Fengshou, a quick calculation master, after 10 years of research. It is a method of calculating directly with the brain, also known as quick mental arithmetic and quick mental arithmetic.

Historical harvest speed algorithm: 1, starting from high position and 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.

Example of speed algorithm exercise

The historical harvest speed algorithm is easy to learn and use. The algorithm starts from the high position, and remembers 26 formulas summarized by the professor of history (these formulas are scientific and interrelated, and need not be memorized) to represent the carry rule of multiplying one digit by multiple digits. If you master these formulas and some specific rules, you can quickly perform operations such as addition, subtraction, multiplication and division, multiplication, root, fraction, function and logarithm. Equal operation.

Give an example of multiplication:

○ Fast algorithm, like traditional multiplication, needs to process every bit of the multiplier bit by bit. We call the number being processed in the multiplicand "standard", and the number from the first digit to the last digit on the right side of the standard is called "last digit". After the standard is multiplied, only the single digit of the product is taken as "this bit", and the number to be carried after the standard is multiplied by the multiplier is "the last bit".

○ The number of digits of the product is the number of digits of the sum of "this addition and last addition", that is-

○ Single digit of sum of standard products = (last ten digits)

○ Then when we calculate, we should find the root and reciprocal bit by bit from left to right, and then add them to get their single digits. Now, let's give a correct example to illustrate the thinking activity in calculus.

(Example) Fill in 0 before the first digit of the multiplicand and list the formula:

0847536×2= 1695072

The carry rule of multiplier 2 is "2 full 5 decimal 1"

0×2 is a 0, the last digit is 8, and the last digit is 1, so it is 1.

8×2 is a 6, and the last digit is 4. If you don't advance, you will get 6 points.

4×2 is an 8, followed by 7, and when it is 5, it will enter 1.

8+ 1 9.

7×2 This is a 4, followed by a 5. When it is full, enter 1.

4+ 1 gets 5.

5×2 is 0, and if the last digit 3 is not input, it is 0.

3×2 is a 6, followed by 6, and when it is full, it enters 1.

6+ 1 7.

6×2 This is a 2, and there is no postposition, so you get 2.

The mind is a method of doing arithmetic only with the brain without any tools. Mainly rely on super memory and clear thinking ability.

Extended data:

The historical harvest speed algorithm 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, plus finger calculation, speeds up the calculation, and can calculate the correct results instantly, helping human beings to develop their brains and strengthen their ability to think, analyze, judge and solve problems. It is a great pioneering work of contemporary applied mathematics.

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 praised it as a miracle in the history of educational science and should be popularized all over the world.

References:

Mental arithmetic-Baidu encyclopedia