|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||
|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!