Invention of the Abacus. (0 ore 3 min, 1 gen 2700 anni a. C. – 0 ore 8 min, 2 gen 2300 anni a. C.)

Descrizione:

The basic purpose of the abacus was to count items before there were computers and calculators. The invention of the abacus likely occurred in Sumeria around 2700 to 2300 B.C.E., which used a base 60 system, but the oldest known example of an abacus is the Salamis Tablet from Greece (300 B.C.E).

source: https://study.com/learn/lesson/abacus-invention-history-architecture.html#:~:text=The%20basic%20purpose%20of%20the,from%20Greece%20(300%20B.C.E).

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