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The abacus is considered the first adding machine because it was the first tool that was used to add with. There were not any counting devices until the invention of the abacus in 3000 BC.
The Chinese abacus
Abacus was invented by the Chinesethe abacus was also known as the first computer
There was evidence of the abacus going back as early as 2700 B.C. And it is still commonly used in certain countries and places like Japan, China, Russia, and the Middle East.
Abacus