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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/mathematics-and-mental-calculation

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