One, two, two, three, five, five, two, three, five divided by two, four, five divided by one, five to five becomes one, six to five becomes one, seven to two becomes five becomes one, eight to two becomes one, nine to one becomes one, three times, the last step, once and for all.

Abacus is an auxiliary tool for manual operation and calculation. It originated in China and has a history of more than 2,600 years. This is an important invention in ancient China. Before Arabic numerals appeared, abacus was a widely used computing tool in the world. Now, abacus continues to be used in parts of Asia and the Middle East, especially in shops, which can be bought from shops that supply goods from China and Japan.

In the west, it is sometimes used to help children understand numbers. Some mathematicians like to experience the feeling of calculating simple arithmetic problems with an abacus.

Related content explanation

Abacus, also known as abacus and abacus, is a simple calculation tool invented by our ancestors. The abacus calculation originated in the Northern Song Dynasty, and it was not counted until the Northern Song Dynasty. Abacus is a simple calculation tool invented and created by the working people in ancient China. China is the hometown of abacus. Today, computers have been widely used. The ancient abacus has not been abandoned, but it is in the ascendant in many countries because of its convenience and accuracy.

Therefore, people often compare the invention of abacus with four great inventions of ancient china. There is an abacus in Zhao Taicheng's medicine cabinet in the famous painting "The Riverside Scene at Qingming Festival" in the Northern Song Dynasty. Because of its convenient and quick operation, abacus has been widely used by working people in ancient China for thousands of years. Even the most advanced modern electronic calculator can't completely replace the abacus.