Abacus

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Classes
Posted 6 years ago
135 views

Abacus

QR CODE
Classes
Posted 6 years ago
135 views

Description

The abacus also called a counting frame, is a calculating tool that was in use in Europe, China and Russia, centuries before the adoption of the written Hindu–Arabic numeral system.
The abacus is an ancient calculating tool, constructed for the system of powers of ten.
An abacus is a manual aid to calculating that consists of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame.
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brainmatrixx
brainmatrixx Registered for 6+ years Last online 6 years ago
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    Abacus
    Abacus by brainmatrixx