From: Sue <sueboundy@gmail.com>
To: Teacher2Teacher Public Discussion
Date: 2011040218:51:17
Subject: Chisanbop!

This was popular back in the 1970s.  I used to teach this technique to
my students and to other teachers. It was interesting, and some kids
loved it.  I still use it when I am adding a long column of numbers
and don't have a calculator handy, but mostly just for fun.  Remember
- back then we didn't have access to all the calculators we have
today.  Here is a link to a good explanation.  
http://www.cs.iupui.edu/~aharris/chis/chis.html

There are books available online, but only used, and quite expensive. 
Our public library actually has a copy, so you might try your library.

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