Re: Credit Crunch


"JpinNY" <jpinny@xxxxxxxxxxx> wrote in message
news:gga01k$6s1$2@xxxxxxxxxxxxxxxxxxxxxx
a l l y wrote:
"JpinNY" <jpinny@xxxxxxxxxxx> wrote in message
news:gfpu8a$kk3$1@xxxxxxxxxxxxxxxxxxxxxx
Just discovering the fun of Indian Weaving Multiplication and Napier's
Bones and trying to figure out Fibonacci numbers.

OK. I know about Napier's bones and the Fibonacci series, but what on
earth is Indian Weaving Multiplication? (I know I could look it up on
Wikipedia, but your explanation would, I'm sure, be much more
enlightening.)

ally

One uses strands representing the multiplier (horizontal weft) and
muliplicand (vertical warp). Where these cross (or intwhich cross each
other, like the weft and warp in a cloth. Unfortunately, to avoid the
explanation requires graphic explanation! It's easy if the numerals are
under 5

To represent the problem 24 x 12, for example, one would represent 24 by
laying out 2 weft rows at the top to represent the twenty, then leave a
space and then lay out 4 more below to represent the four. Then one would
have a pattern like this:

_____________________
_____________________


_____________________
_____________________
_____________________
_____________________


OK. Now you need to add the multiplicand:

You do the same but vertically, with one vertical strand through the left
half of the rows to represent the ten and then two strands through the
second half of the rows to represent the two. I can't represent this in
the time I have available!

You will now have a grid, with four major areas where the warp and weft
intersect or weave into each other.Count the inter sections in the top
left - you should have 2. Write a 2 there. Now count the intersections in
the top right, and the bottom left and you should have 4 and 4. Add those
together to make 8. Circle that in the r. top corner. Now count the bottom
right, which is also 8.

Now you have the values for the hundreds, tens and units - 2, 8 and 8, and
your answer is 288.

It works with larger numbers, too, but that takes some more explanation.


Oh, heck

http://vedicmathsindia.blogspot.com/2006/11/easy-mental-multiplication-trick.html

Gosh, that's fun! I'm trying to figure out why it works, now . . .

ally


.

Relevant Pages

  • Re: Credit Crunch
    ... I know about Napier's bones and the Fibonacci series, but what on earth is Indian Weaving Multiplication? ... One uses strands representing the multiplier (horizontal weft) and muliplicand. ... to avoid the explanation requires graphic explanation! ...
    (uk.local.cumbria)
  • Re: Credit Crunch
    ... I know about Napier's bones and the Fibonacci series, but what on earth is Indian Weaving Multiplication? ... One uses strands representing the multiplier (horizontal weft) and muliplicand. ... to avoid the explanation requires graphic explanation! ...
    (uk.local.cumbria)
  • Re: Credit Crunch
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    (uk.local.cumbria)
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    (uk.local.cumbria)
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