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Chisenbop is a method of doing basic arithmetic
using your fingers. It is attributed to the Korean tradition, but it
is probably extremely old, as the strobe and abacus use very similar
methods. Probably these other devices were derived from finger
counting.
Counting
The key to finger math is understanding how to count. The right
hand stands for the values zero through nine. Each digit counts as
one, and the thumb counts as five. Here's an illustration:
As you can see, digits 0 through four are pretty
self explanatory. The thumb counts as five, so here's how to represent
five through nine:
The left hand represents multiples of ten, with
the right thumb representing 50. Here's how the left hand works:
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0
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10
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20
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30
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40
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50
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60
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70
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80
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90
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Chisenbop Multiplying by 9
Hold out your hands in front of you so that your
thumbs point toward one another.
Visualize that your left pinky finger represents 1, the next finger 2,
and so on left to right, until your right pinky finger represents 10.
Those fingers represent the number you wish to multiply by 9. To do
so, simply put the finger down you wish to multiply by 9. All fingers
to the left of the down finger represent the tens digit of the answer
while all fingers to the right represent the ones digit.
Example: 6 x 9. Put the finger representing 6 down (the right hand
thumb). To the left of the down finger, you have 5 fingers up.
That's your tens digit, 5. To the right, you have 4 fingers up.
There's your ones digit, 4. Put those together and you have your
answer: 54.
read more at...http://www.cs.iupui.edu/~aharris/chis
by Andy Harris
Lecturer, Computer Science
Indiana University / Purdue University - Indianapolis
Author - various computer programming titles.
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