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« Obama is listening | Main | Michele Bachmann: Worst Person In the World »
Arthur Benjamin: Lightning calculation and other "Mathemagic"
Posted on: November 8, 2008 1:45 AM, by Greg Laden
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Comments
Nice! I have little tricks for doing arithmetic quickly in my head, but that just blew my mind.
Posted by: The Science Pundit | November 8, 2008 8:28 AM
I went to college with Art, he's been doing this schtick for about 25 years, it's darned impressive.
Posted by: Larry Osterman | November 8, 2008 12:08 PM
Hi Greg,
if you care to look at my blog for 29th Feb 2008, the URL is
http://home.egge.net/~savory/blog_feb_08.htm ,
I show my readers how to take integer cube roots of e.g. six digit numbers , IN THEIR HEADS, faster than most people can enter the 6 digits in a calculator. Go try it :-)
Posted by: Stu Savory | November 10, 2008 12:45 PM
Stu: cool.
Posted by: Greg Laden | November 10, 2008 12:55 PM