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Home > Abacus

8 External links

• Abacus in Various Number Systems
• Abacus
• Soroban
• Suan Pan
• Webarchive backup: Mesoamerican abacus (this site is no longer online - but the webarchive backup is; however, one of the author’s documents comparing the organization and use of the mesoamerican abacus and the chinese abacus is mirrored at [1]); see also [2]
• Roman abacus
• Abacus Photos and Images
• The World’s Smallest Abacus
• Java applet of Chinese, Japanese and Russian abaci

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AbacusSee also abacus (architecture) a flat slab at the top of a column. An abacus is a calculation tool, often constructed as a wooden frame with beads sliding on wires. It was in use centuries before the adoption of the written Arabic numeral system and is st Abacus logicIn logic, an abacus is an instrument, often called the "logical machine", analogous to the mathematical abacus. It is based on the principle of truth tables. It is constructed to show all the possible combinations of a set of logical terms with their nega Abacus (architecture)In architecture, an abacus (from the Greek abax a slab; or French abaque tailloir) is a flat slab that sits upon the capital of a column, forming its uppermost member. Its chief function is to provide a larger supporting surface for the architrave or arch Abacus systemThe abacus system of mental calculation is a system where users mentally visualize an abacus to do calculations. No physical abacus is used; only the answers are written down. This system is being propagated in Singapore, South Korea, Thailand, Malaysia a