Found 3 comments on HN
happy4crazy · 2011-04-24 · Original thread
If you like this kind of stuff, there are a couple of fun mental math books I can recommend:

http://www.amazon.com/Speed-Mathematics-Secret-Skills-Calcul...

http://www.amazon.com/Secrets-Mental-Math-Mathemagicians-Cal...

It's really baffling that people don't teach this stuff in school.

tokenadult · 2010-03-29 · Original thread
It's interesting that the book cited in the submitted article

http://www.amazon.com/Secrets-Mental-Math-Mathemagicians-Cal...

(this link is to the United States Amazon site, while the submitted article link was to amazon.co.uk)

is written mostly by a professional mathematician, but with an introduction by an author who is a historian by higher education. Michael Shermer writes a number of interesting books,

http://www.amazon.com/Michael-Shermer/e/B001H6MCNY/

of which my favorite is Why People Believe Weird Things: Pseudoscience, Superstition, and Other Confusions of Our Time.

http://www.amazon.com/People-Believe-Weird-Things-Pseudoscie...

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