Recreational Mathematics

Lamplighter · 01-16-2013, 06:32 PM

[quote=ZenGum;847990]Japanese multiplication method

Attachment 42457

This is an interesting illustration.
But I doubt adults use the the method.
It's sort of like kids adding by counting on their fingers.
It's also what we do in algebric multiplication of polynomials...

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Name: polynomial_1.jpg
Views: 287
Size: 36.5 KB

but then if, as Big V asks, what happens with zero's, we leave gaps in the summation:

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01-16-2013, 06:32 PM	#1
Lamplighter Person who doesn't update the user title Join Date: Jun 2010 Location: Bottom lands of the Missoula floods Posts: 6,402	[quote=ZenGum;847990]Japanese multiplication method Attachment 42457 This is an interesting illustration. But I doubt adults use the the method. It's sort of like kids adding by counting on their fingers. It's also what we do in algebric multiplication of polynomials... but then if, as Big V asks, what happens with zero's, we leave gaps in the summation:

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