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08-29-2017 00:26 AM - last edited 08-29-2017 00:46 AM
The first known tools used to aid arithmetic calculations were: bones (used to tally items), pebbles, and counting boards, and the abacus, known to have been used by Sumerians and Egyptians before 2000 BC - wiki (woohh!!)
Just put 1st and 2nd Number then click any Operators.
* maximum number input is 999
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