Comments on: Fast calculations (Trachtenberg system) http://www.daretravels.com/2006/05/23/fast-calculation-trachtenberg-system/ Enjoying life learning :) Wed, 20 Aug 2008 17:06:27 +0000 http://wordpress.org/?v=2.0.4 by: Mental skill games at Personal development for brains - Daretravels.com http://www.daretravels.com/2006/05/23/fast-calculation-trachtenberg-system/#comment-20 Tue, 13 Jun 2006 00:14:58 +0000 http://www.daretravels.com/2006/05/23/fast-calculation-trachtenberg-system/#comment-20 [...] 5. Trachtenberg system is another great fast calculation system. [...] […] 5. Trachtenberg system is another great fast calculation system. […]

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