You can use an abacus to add and subtract quantities of beads by moving the them around. This can in turn help to solve equations involving counting numbers.
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The Chinese abacus
Abacus was invented by the Chinesethe abacus was also known as the first computer
The abacus was originated in China in 3000 B.C.(:
Asiana Abacus was created in 1991.
the abacus is made by the Egyptian in Egypt.