The Trachtenberg Speed System of Basic Mathematics discussion

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EXTENSION TO TRACHTENBERG SYSTEM

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message 1: by Vitthal (last edited Feb 05, 2015 11:11PM) (new)

Feb 05, 2015 11:10PM

Vitthal Jadhav

For extension to trachtenberg system refer
https://play.google.com/store/books/d...
OR
https://www.goodreads.com/book/show/2...

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message 2: by Margret (new) - rated it 5 stars

Feb 10, 2018 10:26PM

Margret Rosenberg

That looks VERY interesting. In what way is it an extension of Trachtenberg's system?

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