Abacus
Use of the abacus, with its beads in a rack, was first documented in Han Dynasty China in about AD190
"Abacus" derives from the Hebrew ibeq, meaning to " wipe the dust" or from the Greek abax, meaning "board covered with dust", which describes the earlier calculating devices used by the Babylonians.
The Chinese version was the speediest way to do sums for centuries and, in the right hands, can still outpace electronic calculators.
"Abacus" derives from the Hebrew ibeq, meaning to " wipe the dust" or from the Greek abax, meaning "board covered with dust", which describes the earlier calculating devices used by the Babylonians.
The Chinese version was the speediest way to do sums for centuries and, in the right hands, can still outpace electronic calculators.
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