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Home🌌Off TopicsOff Topics Main Discussion › Dont have a calculator? Use the box method
01-28-2007 11:39 PM  12 years ago
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chopperman1

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Huntsville, AL

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Dont have a calculator? Use the box method
An interesting new way to mulipy numbers
http://video.yahoo.com/video/play?v...1661607&cache=1
Cliff
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01-29-2007 08:42 AM  12 years ago
Arthur

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Wales. UK

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Fascinating. Anyone know the mathematical theory behind that? Thats assuming it works all every time. Only works with whole numbers apparently.
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01-29-2007 02:03 PM  12 years ago
copperclad

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NY

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Only works with whole numbers apparently.
hi
it works with fractions too , if you try 12.3 X 3.21 = ?

count the number of digits to the right of the decimal points , ( in this case three ) then just put the decimal point three positions from the right in your answer ( 39.483 ) , dana
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01-29-2007 09:32 PM  12 years ago
Ed Moore

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West Sussex, UK

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Fascinating. Anyone know the mathematical theory behind that?
If you think about it, it is just a graphical representation of numbers rather than being anything inherently clever (that's not to say it isn't cool!).

If it were 2 x 2, you'd have this: // , intersecting this: \\ , and so end up with 4 points of intersection. It's sort of common-sensy. To look at it another way, let's randomly say we want to do 7 x 9.

You draw a box. 7cm x 9cm, and then split it up into a 1cm grid. If you count the number of boxes, you get 63! Sure, obvious, but that video isn't really much more than that.
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