Originally Posted by onthegomom
Here is the book I'm referring to
Secrets of mental math : the mathemagician's guide to lightning calculation and amazing math tricks / Arthur Benjamin and Michael Shermer

Arthur Benjamin's books are very popular among gifted kids. My son adores him. Arthur Benjamin is also an author of Joy of Mathematics DVD, another highly recommended resource.

If you have a mathy kid then chances are really good he will like Arthur Benjamin's books and videos.

LMom