Multiplication by multiplication table is not the inevitable result of carry system. Babylon had a 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 product. The Mayans' mathematics is the most advanced in the ancient civilization in the Western Hemisphere, using the decimal system, but they did not invent the multiplication table. It can be seen that from the carry system to the multiplication table is a lot of progress.

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

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The characteristics of Jiujiu Watch-

1, 99 tables generally use only 9 numbers from one to nine.

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

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

4. Jiujiu Watch has existed for at least 3,000 years. It was used in the calculation from the Spring and Autumn Period and the Warring States Period, and was improved and used in the abacus in the Ming Dynasty. Jiujiubiao is also the basic skill of elementary school arithmetic.