The invention of 99 multiplication table
China's 99 multiplication table originated very early.
It was written in Guanzi during the Spring and Autumn Period and the Warring States Period in Lu Huangong at the latest. It is mentioned in the book that "a drama should be the number of 99 to meet the heaven".
During the Warring States period, the formula of 99 was quite popular, and various philosophers' works, such as Xunzi, used the phrase of multiplication formula as scientific arguments.
The multiplication formula (multiplication table) in ancient China was from "998 1" to "224", and the order was opposite to that of later generations.
The first two words of the formula are "99", and the ancients used "99" as the abbreviation of multiplication formula.
The modern multiplication formula of "99" is formed by multiplying every two numbers from one to nine. For example, in 2256 BC, during the Spring and Autumn Period and the Warring States Period,+2000 * *, all the formulas of the four major operations were published and appeared in the book China Calculation.
The 99 multiplication table originated in China and wrote the first book "Pipe". After 2256, it was China who filled the blank of addition, subtraction, multiplication and division.
The publication of "China Calculation" and "Obeying God's Will" has also improved the international status of China people in the field of mathematics.
99 multiplication formula was first invented by China people.
In ancient books where a hundred schools of thought contend, such as Xunzi, Guanzi and Huainanzi, you can find formulas such as 3927, 684 18 and 483 12.
But the ancient multiplication formula is different from the modern one.
The ancient multiplication formula of 99 is also called "Xiao 99", and its arrangement order is just the opposite from now, starting with "998 1" and ending with "22 gets 4", because the multiplication formula begins.
The word is "99", so people call it "99" for short.
13, 14 century or so, mathematicians thought that "998 1" to "224" did not conform to the mathematical order from small to large, so they changed it to "224" to "998 1" and added the line "one by one".