The abacus has a long history in china and is the crystallization of the wisdom of the working people. It can be called an ancient Chinese computer. The Ziyu Abacus is based on the original abacus, which has been improved and refined. It is of some significance to understand the ancient arithmetic methods and carry rules for us.
Introduction of Ziyu Abacus Inventor_Zhou Maoqi
Ziyu Abacus photo
