With this traditional Chinese abacus you can do multiplication, division, addition, subtraction and even square root and cube root operations at high speed! Moreover you can make calculations in both decimal and hexadecimal systems.
Calculators? Who needs calculators? 
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heomap 作 , # 2007/04/13 21:29:07
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Mr.Fantasy 作 , # 2006/12/29 13:20:34
The multi-widget trick works even better if you have one widget in normal position, and the other(s) always in front or back. Position the widgets so that their side borders look like one central bar, which can be used as decimal marker. Only the buttons will show through, but that's no big deal. As long as you don't click on them.
Erestor 作 , # 2006/10/11 0:56:05
Learning that I could also use the thing for hex math was even more interesting. I moddified the code of the widget to display A-F for numbers 10 or higher, so now it fits my style a bit better.
Thanks again for a really niffty widget.
Jearil 作 , # 2006/10/06 15:59:38
: The Code is quite simple, harder are the graphics. So either recode the widget broader (same with the background) or simlply use TWO or more instances of Abacus - then you have "more twenty or thirty" columns ;-)
German introduction to Abacus at: http://www.benjaminwrightson.de/abakus/homepage.htm
Worldwide Abacus-Fotos see at: http://www.uni-greifswald.de/~wwwmathe/RTS/node4.html (University of Greifswald, Germany)
God bless You.
f-t-hofmann 作 , # 2006/09/15 18:36:40
The number of rods is a bit small for serious work, though. Maybe increase to some twenty or thirty? Please? Dots on the bar (Japanese) would also be welcome. And when a rod has a value > 9, it might be an idea to display hex A-F down below. So far my wishlist.
Recommended website for abacus learning: http://webhome.idirect.com/~totton/abacus
Enjoy!
Erestor 作 , # 2006/08/27 15:07:57
To make this widget even cooler give user more variants of abacus to choose from (Russian, Japanese, Roman). And in the help give an explanation how to use each one. http://en.wikipedia.org/wiki/Abacus
FataL 作 , # 2006/08/14 20:34:45
seifip 作 , # 2006/08/11 16:38:43
grafio 作 , # 2006/08/09 16:41:49
FataL 作 , # 2006/08/09 5:20:33
http://www.ee.ryerson.ca/~elf/abacus/
http://www.sungwh.freeserve.co.uk/sapienti/abacus01.htm
grafio 作 , # 2006/08/07 11:07:45