[BlindTlk] neat math trick

[Jude DaShiell]

The one thing that's especially nice about this technique is that you
can show all of your work on paper.  It's not like using and relying on
the abacus where none of your work ends up on paper.
To do this effectively, the first table is written with the halves and
doubles column.  Then the second table is written which at first copies
the first table and then you erase all lines with even numbers in the
left column.  I use full braille cells to erase those lines so there's
no possible ambiguity.  Then sum the numbers in the right column of the
second table and you got your answer.  The abacus endangers use of
braille in mathematics and that does nobody any favors in preparation
for higher math.  The reason for that is if you learn arithmetic
properly, you learn to do all of it on braille paper and then you're
able to transfer that arithemetic learning into writing equasions and
inequalities when you get into higher mathematics.  Such learning makes
equasions easier to solve as well as inequalities later.
The abacus is good at what it does and me being into numerology I find
it really helpful for the array calculations done in numerology but it's
also limited and limiting.

On Mon, 17 Feb 2020, danjhicks--- via BlindTlk wrote:

> Date: Mon, 17 Feb 2020 04:54:27
> From: danjhicks--- via BlindTlk <blindtlk at nfbnet.org>
> To: 'Blind Talk Mailing List' <blindtlk at nfbnet.org>,
>     conjunction at yahoogroups.com
> Cc: danjhicks at yahoo.com
> Subject: Re: [BlindTlk] neat math trick
>
> This really works and it is fun. When I first encountered this technique, it
> was called Russian Peasant Multiplication.
>
> Dan Hicks
> NFB of Florida
>
> -----Original Message-----
> From: BlindTlk <blindtlk-bounces at nfbnet.org> On Behalf Of Jude DaShiell via
> BlindTlk
> Sent: Thursday, February 13, 2020 6:03 PM
> To: conjunction at yahoogroups.com
> Cc: Jude DaShiell <jdashiel at panix.com>; blindtlk at nfbnet.org
> Subject: [BlindTlk] neat math trick
>
> For multiple digit multiplication beyond times tables range and for counting
> numbers.
> Originally known as Egyptian Multiplication.
>
> Write two multiplicands on a line and this is best done on paper.
> First multiplicand gets divided by two with remainders thrown away all the
> way down to zero in its column.
> Second multiplicand gets doubled until the last number is on the line with
> the zero from the first multiplicand.
> Every line with an even number in the first column gets erased.
> Finally add up every number in the second column for your answer.
>
>
>
> --
>
>
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