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The abacus was invented around 2,700-2,300 BCE, by the Sumerians (Mesopotamia); that makes the invention about 4,400 years old.

This is the oldest dated abacus, there are several versions between 2,700 - 1,000 BCE, with many groups claiming responsibility for the invention.

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2015-10-29 06:42:46
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Q: When was the abacus invented?
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