## Multiplying N x N numbers

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• Is there any site about multiplying two numbers mentally? Is there any way to multiply two numbers without having to remember a lot of numbers [except carry s
Message 1 of 5 , Jul 3, 2005
Is there any site about multiplying two numbers mentally? Is there any
way to multiply two numbers without having to remember a lot of
numbers [except carry's and answers maybe]?

I am new to this, and I don't know where to find information on any of
this. So maybe a more appropriate question would be: Where should I
start if I want to multiply large numbers together?

Thanks!
• ... Trachtenberg s speed system of basic mathematics might be a good place to start. http://www.amazon.com/exec/obidos/ASIN/0285629166/rekordklubsaxoni
Message 2 of 5 , Jul 3, 2005
14/m/usa wrote:
> Is there any site about multiplying two numbers mentally? Is there any
> way to multiply two numbers without having to remember a lot of
> numbers [except carry's and answers maybe]?
>
> I am new to this, and I don't know where to find information on any of
> this. So maybe a more appropriate question would be: Where should I
> start if I want to multiply large numbers together?
>
> Thanks!

"Trachtenberg's speed system of basic mathematics" might be a good place
to start.

http://www.amazon.com/exec/obidos/ASIN/0285629166/rekordklubsaxoni

Regards,
Vikas
• Hi; To be able to calculate quickly and easily any 2 digit number, extend your multiplications table to 25 x 25; (although up to 12 x 12 could be sufficient
Message 3 of 5 , Jul 4, 2005
Hi;

To be able to calculate quickly and easily any 2 digit number, extend your multiplications table to 25 x 25; (although up to 12 x 12 could be sufficient too but makes principle more difficult in practice)
25 X 25 require only 325 facts
actually 170 new facts ( 55 facts with the 10 x 10 table )
from the 170 it's still possible to remove other facts.

Emmanuël

14/m/usa <mrcubist@...> a écrit :
Is there any site about multiplying two numbers mentally? Is there any
way to multiply two numbers without having to remember a lot of
numbers [except carry's and answers maybe]?

I am new to this, and I don't know where to find information on any of
this. So maybe a more appropriate question would be: Where should I
start if I want to multiply large numbers together?

Thanks!

---------------------------------
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• I have looked into the Trachtenberg system a little bit. But are Trachtenberg s multiplication procedures designed for the mind? i.e. can an average/above
Message 4 of 5 , Jul 4, 2005
I have looked into the Trachtenberg system a little bit. But are
Trachtenberg's multiplication procedures designed for the mind? i.e.
can an average/above average, or so, person use Trachtenberg's system
mentally?

Thanks again
Robert

----
----
> "Trachtenberg's speed system of basic mathematics" might be a good
place
> to start.
>
> http://www.amazon.com/exec/obidos/ASIN/0285629166/rekordklubsaxoni
>
> Regards,
> Vikas
• Do you want to look at 2 numbers and, while looking at them, say from right to left the answer? Also, recently, there was described a very achievable way of
Message 5 of 5 , Jul 5, 2005
Do you want to look at 2 numbers and, while looking at
them, say from right to left the answer?

Also, recently, there was described a very achievable
way of mentally calculating a 3 digit by 3 digit
number (cross multiplication):
http://www.geocities.com/mentalmathandcatlover/multiplication.html

I understand that Trachtenberg is a great way to
obtain an answer from right to left.

Another pursuit is to use mnemonics to memorise the
question itself and to mentally produce the answer and
then to announce it from left to right - but this is
much slower and less entertaining for an audience, I
would imagine.

Mike

--- Robert <mrcubist@...> wrote:

> I have looked into the Trachtenberg system a little
> bit. But are
> Trachtenberg's multiplication procedures designed
> for the mind? i.e.
> can an average/above average, or so, person use
> Trachtenberg's system
> mentally?
>
> Thanks again
> Robert
>
>
> ----
> ----
> > "Trachtenberg's speed system of basic mathematics"
> might be a good
> place
> > to start.
> >
> >
>
http://www.amazon.com/exec/obidos/ASIN/0285629166/rekordklubsaxoni
> >
> > Regards,
> > Vikas
>
>
>
>
>
>
>
>
>
>
> MentalCalculation-unsubscribe@yahoogroups.com
>
>
>
>
>

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