The Magic of Math: Solving for x and Figuring Out Why 
cool new book!


Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks 
lightning arithmetic!


The Book of Numbers 
beautiful and accessible


The Shape of Space (Chapman & Hall/CRC Pure and Applied Mathematics) 
topology that will stretch your mind


A Mathematical Mosaic: Patterns & Problem Solving 
a cool book with lots of fun facts


Proofs from THE BOOK 
elegant proofs at an advanced level


Which Way Did the Bicycle Go?: And Other Intriguing Mathematical Mysteries (Dolciani Mathematical Expositions) 
a fun set of challenging problems


Proofs without Words: Exercises in Visual Thinking (Classroom Resource Materials) (v. 1) 
proofs by picture!
