Chisanbop: Advanced Counting on FingersDate: 3/18/96 at 5:29:34 From: Harbin Subject: Counting fingers I saw on TV years ago kids in 1st grade doing advanced math by counting on their fingers. They were using their fingers as some kind of abacus or something. Does anybody know of this technique, and where I can find out more about it? Thanks, Harbin Osteen Date: 6/24/96 at 20:20:26 From: Doctor Jodi Subject: Re: Counting fingers Hi Harbin! There's a tutorial by Andy Harris on this method, called chisanbop, on the Web at: http://www.cs.iupui.edu/~aharris/chis/chis.html Here's more information: Chisanbop is an easy, lightning-quick calculator developed by a Korean schoolteacher, Sung Jin Pai. Your grade-school kids can learn to use it in minutes. It requires two hands. Try it yourself first. Place your hands palm-down on a table, fingers spread. That's zero. Now make two fists. Your calculator now reads 99, the highest value. Reading from left to right now, each of the four fingers on your left hand equals ten; the left thumb equals fifty; the right thumb equals five; and each of the four fingers on your right hand equals one. Now construct different numbers on your own. Two thumbs folded under could only equal 55; two index fingers, 11. Let's try a sample problem: 18 + 26. Show 18 by pressing down the left index finger and the right thumb, index, middle, and ring fingers. Now: Think of 26 as 10, 10, 5, and 1. The first two 10s are easy: Press down the middle and ring fingers on your left hands. The 5 is the only tricky part; you exchange between hands. Lift the right thumb (subtracting 5), then press down your left pinky (adding 10, for a net gain of 5). For the 1, press down the right pinky. Your hands now read 44 - the correct answer! And I was browsing the library the other day and found _The Complete Book of Fingermath_ by Edwin M. Lieberthal (McGraw-Hill, 1979), which I recommend. I hope this helps - please let us know if we can help again. -Doctor Jodi, The Math Forum |
Search the Dr. Math Library: |
[Privacy Policy] [Terms of Use]
Ask Dr. Math^{TM}
© 1994- The Math Forum at NCTM. All rights reserved.
http://mathforum.org/dr.math/