Jiujiubiao, also known as Jiujiusong and Jiuyinsong, is the basic calculation rule of decimal multiplication and division in ancient China. It has been used for more than two thousand years in the Spring and Autumn Period and the Warring States Period. Now primary school students and some school-age children can recite it. The origin of "small ninety-nine"

The 99-99 multiplication melody is also often called "Little 99". At present, the formula for students to learn "elementary ninety-nine" is from "11" to "998 1", while in ancient times it was the other way around, from "998 1" to "224". Because the first two words of the formula are "99", people call it "99" for short. It was only in the 13 and 14 centuries that it turned into the present situation.

China used the "99 formula" earlier. Sentences such as "3927", "684 18", "483 12" and "6636" can be found in books such as Xunzi, Guanzi, Huainanzi and Warring States Policy. It can be seen that as early as the Spring and Autumn Period and the Warring States Period, 99 multiplication songs became popular.

Nowadays, people generally describe those who are good at calculating, calculating and planning as having a "career" in mind.

Mathematical edition multiplication formula table

1× 1= 1

1×2=2 2×2=4

1×3=3 2×3=6 3×3=9

1×4=4 2×4=8 3×4= 12 4×4= 16

1×5=5 2×5= 10 3×5= 15 4×5=20 5×5=25

1×6=6 2×6= 12 3×6= 18 4×6=24 5×6=30 6×6=36

1×7=7 2×7= 14 3×7=2 1 4×7=28 5×7=35 6×7=42 7×7=49

1×8=8 2×8= 16 3×8=24 4×8=32 5×8=40 6×8=48 7×8=56 8×8=64

1×9=9 2×9= 18 3×9=27 4×9=36 5×9=45 6×9=54 7×9=63 8×9=72 9×9=8 1