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1h 48min, jan 1, 500 y BC - Abacus- a counting frame used by many countries before the Hindu and Arabic numeral system. Used For addition, subtraction and simple equations
Added to timeline:
skurka class
By
tyler
20 Oct 2017
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0
634
Date:
1h 48min, jan 1, 500 y BC
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~ 2527 years ago
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