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The name was first used before 1387 A.D. when a Middle English work used a Latin word to describe a sandboard version of it.
On an Abacus, the large number of beads are used as numbers with a value of 1, the smaller number of beads are used with a number value of 5.
The Abacus: The World's First Calculating Device
A similar device to the Abacus is the Japanese Soroban, which is an Abacus, but has 1 Heaven bead and 4 Earth beads on each Bead instead.
The Abacus was first founded around 2700 - 2300 B.C.
Links:
The Abacus is used by sliding a Earth bead to the opposite side it was on, then sliding a Heaven bead to the opposite side for each Earth bead on the same line.
Example (Bead lines labeled A to M, from left to right): 1 Heaven bead (J) and 3 Earth beads (L) = .503
If your Abacus frame is warped the first time you use it, lie it down on a flat surface and press down on each corner individually. After you find the warped corner, cut out small, L shaped pieces from a 3X5 card on the corner until it is fixed.
The earliest form of an Abacus is an Abaci, which is a early B.C. table with anything solid to count with.
One of the earliest forms of the Abacus used beads stung on wires around 3000 B.C.
Although obsolete, the Abacus is the cheapest, most environmentally friendly form of a calculator, and also lasts longer than most other calculators will.
The name Abacus was derived from the Greek word "Abax" meaning either "Dust" or "Sand
The Abacus has different names in different languages: China - Suanpan Japan - Soroban Russia - Schoty
An Abacus is the cheapest, most useful calculating device for people with very little or no sight.
The Egyptian Abaci have the pebbles moved from right-to-left, the opposite of the Greek Abacus.
http://www.webopedia.com/DidYouKnow/hardware_software/2002/fivegenerations.asp http://wall.alphacoders.com/wallpaper.php?i=68856 http://en.wikipedia.org/wiki/Abacus http://www.chinancient.com/chinese-abacus/ http://webhome.idirect.com/~totton/abacus/pages.htm http://www.ideafinder.com/history/inventions/abacus.htm http://www.bigsiteofamazingfacts.com/how-did-the-abacus-get-its-name-what-does-abacus-mean-in-greek-and-where-did-the-abacus-come-from http://www.encyclopedia.com/topic/abacus.aspx
Every Continent had some form of the Abacus before contacting another Continent.
