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An abacus
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.
An abacus could be considered an early ancestor to the calculator. It was made of wood and had wooden beads that slid on wires and were used to calculate arithmetic problems.
The Chinese abacus
Abacus was invented by the Chinesethe abacus was also known as the first computer