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. 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. Merchants, traders and clerks in some parts of Eastern Europe, Russia, China and Africa use abacus, and they are still used to teach Arithmetic to children.
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The 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. Calculations can be made at great speed in this way.
This system is being propagated in China, 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.