The mnemonic of the abacus and the method of playing it are as follows:

The mnemonic for the use of the abacus is: the two strings are interlocked, multiplying and dividing on the left and right; the five beads are in the right hand, and the number is advanced by one and retreated by ten.

The meaning of this mnemonic is that when calculating through the abacus, the left strings represent multiplication and division, the right beads represent numbers, and the process of calculation is carried out from left to right. In calculating multiplication, the left hand string is used to multiply the right hand bead.

The abacus is very simple to use, and you only need to familiarize yourself with the basic techniques and rules to be able to use it quickly for calculations. It has the advantages of fast calculation speed and high accuracy, especially in doing math operations such as addition, subtraction, multiplication, division, square root, etc., which are far more efficient than hand calculations and electronic calculators.

The abacus presents numbers and operators in the form of beads, beams, bamboo sticks and other materials, making it easy for users to visually grasp and highlight the calculation process. Abacus is small and lightweight, easy to carry, suitable for use in outdoor, traveling, exams and other occasions. Most of the materials used in the production of the abacus are natural materials, such as bamboo, etc., which are durable and not easy to be damaged.

Abacus addition, subtraction, multiplication, division of the operation

1, addition: the two numbers to be added from right to left bit by bit on the abacus on the corresponding position, and then from the lower to the higher columns to be added. If the sum of a column exceeds 4, move the feed bead to the unit bead of the previous column. The final result obtained is the sum of the two numbers.

2. Subtraction operation: place the subtracted number on the left side of the abacus and the subtracted number on the right side. Starting from the low position, subtraction operation bit by bit. If a column of the subtracted number is less than the subtracted number, you need to borrow a place to the left column. This is done by moving the rounding bead to the unit bead in the next column and adding the subtracted number by 5. The final result is the difference between the two numbers.

3. Multiplication: Place the multiplied number on the left side of the abacus and the multiplier on the right side. Starting from the low position, multiplication operation is carried out bit by bit, and the result of multiplying the multiplier by the multiplied number is placed in the corresponding position. Finally, add the results in each column to get the final product.

4. Division: Place the divisor on the left side of the abacus and the divisor on the right side. Starting from the higher place, divide bit by bit, subtract the divisor from the divisor gradually to get the quotient and remainder. The quotient is placed on the left side of the abacus and the remainder on the right.