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Around 2500BC the first Abacus appeared in Sumaria. It arrived in Persia about 600BC. The Greek Abacus is recorded to have been in use about 500BC
The Chinese abacus
Abacus was invented by the Chinesethe abacus was also known as the first computer
Nobody knows who was first because they were invented thousands of years ago in Babylon.
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.