Multiplication table (printed version)

The multiplication formula table is as follows:

Multiplication by multiplication table is not the inevitable result of carry system. Babylon had the carry system, but they didn't invent or use the multiplication table in the form of 99 tables, but invented the square table method to calculate the products. The Mayans' mathematics was the most advanced in the ancient civilization in the Western Hemisphere, and they used the decimal system, but they didn't invent the multiplication table. It can be seen that there has been a lot of progress from the carry system to the multiplication table.

China not only invented the decimal system, but also invented the Jiujiu Watch during the Spring and Autumn Period and the Warring States Period. Later, the East was introduced to Korea and Japan, and then spread to India and Persia in the west through the Silk Road, which became popular all over the world. Decimal system and nine tables are important contributions of ancient China to world culture. Nowadays, countries around the world rarely use multiplication in Greece and other countries.

Extended data

The characteristics of ninety-nine watches-

General 1 and 99 tables only use 9 numbers from 1 to 9.

2. The shortest multiplication table in the ancient world. Maya multiplication table must have 190, Babylon multiplication table must have 1770, and Egypt, Greece, Rome, India and other countries must have infinite multiplication tables; Only 45/8 1 item is needed for the 99 table.

3. There is rhythm when reading aloud, which is convenient for memorizing the whole table.

4. Jiujiu watches have existed for at least 3000 years. It was used for calculation from the Spring and Autumn Period and the Warring States Period, and was improved and used for abacus in the Ming Dynasty. The 99 standard is also the basic skill of elementary school arithmetic.