Decimal multiplication and division:

1. The score is multiplied by an integer, the denominator remains the same, and the numerator is multiplied by an integer, and finally the offer score can be reduced.

2. The score is multiplied by the score, the numerator is multiplied by the numerator, the denominator is multiplied by the denominator, and finally the offer score that can be lowered.

Divide a fraction by an integer, and the denominator remains the same. If the numerator is a multiple of an integer, divide the numerator by the integer, and finally you can reduce the number of offer points.

Divide a fraction by an integer, and the denominator remains the same. If the numerator is not a multiple of an integer, multiply this score by the reciprocal of the integer, and finally the offer score can be reduced.

5. The score divided by the score is equal to the reciprocal of the divisor multiplied by the divisor, and finally the offer score that can be reduced.

Fractional multiplication and division includes fractional multiplication and fractional division. Fractional multiplication refers to the numerator of a fraction multiplied by the numerator and the denominator multiplied by the denominator. What can be subtracted must be subtracted first, and the numerator cannot be multiplied by the denominator. Fractional division is a calculation method that the dividend is multiplied by the reciprocal of the divisor to get the result. Fractional multiplication and division is calculated by multiplication and division and reciprocal. The result of fractional multiplication and division needs to be simplified.

Multiply development:

In the process of arithmetic development of various civilizations, the generation of multiplication operation is a very important step. A civilization can successfully develop counting methods and addition and subtraction operations, but it is not so easy to create simple and feasible multiplication methods. The vertical calculation of multiplication seems simple, but it is necessary to master the formula table of 99 multiplication in advance;

Considering this, this vertical calculation is not perfect. It will soon be seen that in the development of mathematics, different civilizations have created different multiplication methods, and some can even abandon the multiplication table completely.

The use of hexadecimal has brought great obstacles to the development of multiplication in ancient Babylonian mathematics, because to memorize the multiplication table of 59-59, at least 1000 items must be memorized. By the time you recite it, it is estimated that the final paper has been written. Another archaeological discovery tells how to avoid using multiplication tables in ancient Babylonian mathematics.