Trachtenberg system
System of rapid mental calculation
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Trachtenberg system
System of rapid mental calculation
The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly.
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From Wikipedia
The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Ukrainian-Jewish mathematician and engineer Jakow Trachtenberg in order to keep his mind occupied while being held prisoner in a German Nazi concentration camp. This article presents some methods devised by Trachtenberg. Some of the algorithms Trachtenberg developed are for general multiplication, division and addition. Also, the Trachtenberg system includes some specialised methods for multiplying small numbers between 5 and 13. The section on addition demonstrates an effective method of checking calculations that can also be applied to multiplication.
Text: Wikipédia, CC BY-SA 4.0. · Image: Holretz (CC BY-SA 4.0) ·
