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Just multiplied a 10 digit number by 12 in my head!! Blog Discussion

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This is a chat forum discussion on Martin's 'Just multiplied a 10 digit number by 12 in my head!!!!!' blog which you can read here.
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‹(•¿•)› Those that understand binary and those that do not!
Veni, Vidi, VISA ! ................. I came, I saw, I PURCHASED
S LOWER CASE OMEGA;6.59 so far ..
This numbers one sounds more usefull though I hardly ever have to work things out anyway.
http://www.play.com/play247.asp?source=327&page=title&Cur=257&r=BOOK&title=429184&tduid=2a20b8f722f3cec5aa96ed02e3a4c88a
http://mathforum.org/dr.math/faq/faq.trachten.html
But my word! It's not exactly straightforward !
While i can (sometimes) do three figures by two figures now ie 248 x 38.
As for the rocess of a 10 figure by 12 in my head, you effectively do it one digit at a time (in reverse!) i couldn't remember it.
Thus if someone said multiply 2285643939 by 12, I couldn't reel off the number. However I could write it down without any workings
martin
Please note, answers don't constitute financial advice, it is based on generalised journalistic research. Always ensure any decision is made with regards to your own individual circumstance.
http://en.wikipedia.org/wiki/Trachtenberg_system
A few years later (about 15 years actually), I was telling a friend about it and I couldn't find the book anywhere, so we both bought a copy on Amazon and amazed each other with ridiculous sums over the phone.
Indeed, this method of maths is the ONLY method they teach in Switzerland - my partners family all live in Switzerland and so I asked them to verfy the claim in the book and it's true - apparently!
Very good read - even the intro which is a brief history of Tractenburgs life.
(start at the bottom)