## Classics of Recreational Math

June 10, 2016 Leave a comment

The classical recreational math authors are Lewis Carroll, Henry Dudley, Martin Gardner, Sam Loyd, and Yakov Perelman.

This an example of classical math puzzles: http://www.aplusclick.com/k/5423.htm :

(10^{2} + 11^{2} + 12^{2}) – (13^{2} + 14^{2}) = ?

The picture “Mental Count” of Russian painter Nikolay Bogdanov-Belsky contains the simple calculation. Image source : Wikipedia