
BGonline.org Forums
How to do 1296 Division Quickly and Accurately
Posted By: RobertFontaine
Date: Sunday, 18 October 2015, at 8:44 p.m.
In Response To: How to do 1296 Division Quickly and Accurately (Jake Jacobs)
The problem that I have with Trachtenberg is that it is right to left...
It's an excellent system for a pencil and a little bit of paper but left to write is so much quicker to work through in your head.
The basic vedic multiplication tricks (left to right multiplication)  the arthur benjamin book is a nice intro, learning your squares to 99^2, and getting a good sense of using difference of squares can make you with basic the simple functions. If you learn your rough log tables very large estimation opens up quickly.
Having a decent peg system based on the major system lets you hold your subtotals very effectively without errors.
That said I'm still a 2x2 multiplyer and my first 100 squares can take me a bit sometimes when I don't see an obvious shortcut.
The other problem I have of course is that if I don't practice the skill doesn't stick. Probably best to start very young like the children who do Soroban (mental abacus calculation  lightening addition). It is a fun little hobby though and it doesn't cost anything to learn to add subtract multiply and divide...
I always like these little toys for a tune up http://www.jimmyr.com/blog/speed_math.html http://windhoff.net/mental_arithmetic/
and this forum for practical advice http://mt.artofmemory.com/forums/mathematicsandmentalcalculation

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