The multiplication formula is also called 99 multiplication formula, which can be divided into "big 99" and "small 99".
Now the multiplication formula begins with "one by one", but in ancient times it began with "998 1"-so it is called "999 multiplication formula".
The multiplication formula is divided into "big 99" and "small 99".
There are 45 sentences in Xiao Jiujiu: one gets one; One two gets two, two two gets four; One three gets three, two three gets six, and three three gets nine; ..... 998 1. The multiplication formula table in the current primary school mathematics textbook is "Xiao Jiujiu".
There are 8 1 sentences in Da Jiu Jiu. There are 36 more sentences than "Little Ninety-nine" because there are "two three get six" and "three two get six"; There are "4520" and "5420"; ……