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Trachtenberg System of Mental Calculation

pid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly.

It is intended to mean "half the digit, rounded down" but for speed reasons people following the Trachtenberg system are encouraged to make this halving process instantaneous. Professor Trachtenberg fled to Germany when the czarist regime was overthrown in his homeland, Russia, and lived there peacefully until his mid-thirties when his anti-Hitler attitudes forced him to flee again. Rapid Mental Computation System as a Tool for Algorithmic Thinking of Elementary School Students Development", European Researcher 25(7): 1105–1110, 2012.

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