16 ч 46 мин, 25 фев 4 г. до нашей эры - Use of counters to aid calculations: 3rd - 6th century B.C

Описание:

Requirement of simple calculations were done in innovative ways with stones, pebbles and they
even used bones. These were called counters. We can find many versions of the abacus now with
more complicated calculation abilities. Counting on fingers and abacus models were used.

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