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Neato! - 9/9/2006 7:35:18 PM

surly

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From: usa
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russian multiplication

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RE: Neato! - 9/10/2006 9:38:13 AM

SohCahToa

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Here is another well known but strange method of Russian multiplication.

Say for example in the case of 23 x 42 double the figure on the right and half the figure on the left ignoring fractions i.e. 23/2 = 11.5 but call it 11.

23        42
11        84
5         168
2          336
1          672

Now remove lines with numbers on the left that are even.

23        42
11        84
5          168
1          672

Last of all add up the numbers on the right that remain.
= 966

I tend to use a calculator these days lazy aren’t I?

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RE: Neato! - 9/10/2006 7:52:42 PM

surly

Posts: 148
Joined: 8/17/2006
From: usa
Status: offline

wow! that is extensive. how bout this?

23x42

multiply 23 by 4

(92)

then do the same with the 2: 23 x 2 (46)

now add them up leaving the respective answers in the respective places (92 in tens place and 46 in the ones place):
92
+46
-------
966

i hear ya on the whole calculator thing! *lol*

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RE: Neato! - 9/10/2006 7:53:46 PM

cuddleheart50

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From: Kentucky
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Math was never one of my strong points.

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RE: Neato! - 9/13/2006 6:21:46 AM

surly

Posts: 148
Joined: 8/17/2006
From: usa
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mine either. ;)

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