From TheBestLinks.com
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.
This system is being propagated in Singapore, South Korea, Thailand, Malaysia and Japan. Mental calculation is said to improve mental capability, increases speed of response, memory power and concentration power.
Some veteran abacus users 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.
See also
There are other methods of mental mathematics:
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