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The abacus system of mental calculation is a system where users mentally visualize an abacus to do calculations.〔(【引用サイトリンク】title=Research on the benefits of mental abacus for development )〕 No physical abacus is used; only the answers are written down. Calculations can be made at great speed in this way. For example, in the Flash Anzan event at the All Japan Soroban Championship, champion Takeo Sasano was able to add fifteen three-digit numbers in just 1.7 seconds. This system is being propagated in China,〔(【引用サイトリンク】title=(Chinese)Teaching Kids Visit to use abacus for mental calculation )〕 Singapore, South Korea, Thailand, Malaysia, Japan and India. Mental calculation is said to improve mental capability, increases speed of response, memory power, and concentration power. Many veteran and prolific abacus users in China, Japan, South Korea, and others who use the abacus daily, naturally tend to not use the abacus anymore but perform calculations by visualizing the abacus. This was verified when the right brain measured heightened EEG activity when calculating and compared with non-veterans who were using the abacus to perform calculations. The standard abacus can be used to perform addition, subtraction, division, and multiplication; the abacus can also be used to extract square-roots and cubic roots. == See also == * Abacus logic * Abacus 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mental abacus」の詳細全文を読む スポンサード リンク
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