Eighty-nine and seventy-two mathematics represent ninety-nine multiplication tables. According to relevant data, the 99 multiplication table is a multiplication formula in mathematics, and its alias is 99 songs, which was produced in the Spring and Autumn Period and the Warring States Period. Algorithmically speaking. The multiplication formula (also called "Jiujiusong") has been produced in China for a long time. As early as the Spring and Autumn Period and the Warring States Period, Jiujiu songs have been widely used by people. In many works at that time, some multiplication formulas have been quoted. The original 999 song begins with "998 1" and ends with "224", with 36 phrases. Bamboo slips unearthed in Han Dynasty and ancient wooden slips unearthed in Dunhuang all started from "998 1". The name "99" is the two words at the beginning of the formula. During the 5th ~10th century, the formula of "99" was extended to "one to one". About the Song Dynasty (1 1 and12nd century), the order of Jiujiu songs became the same as that used in modern times, that is, from "one for one" to "9981". The 45 formulas contained in Zhu Shijie's book "Arithmetic Enlightenment" in Yuan Dynasty changed from "1 1" to "99", also known as the nine-number method. There are two kinds of multiplication formulas used, one is 45 sentences, usually called Xiao Jiujiu; There is also a sentence of 8 1, which is usually called the big nine nine. According to the book, Da Jiujiu was first seen in Chen Jie's Algorithm Achievement in Qing Dynasty.