The Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math TricksWhether you are a math wiz, or struggle to do basic arrhythmic in your head, this is book is wizard! And by wizard we me genius! Thoughtfully explained math principals combine with easy to learn calculation techniques to produce competence and confidence in mental math. Learn to quickly multiply and divide triple digits, compute with fractions, and determine squares, cubes, and roots without blinking an eye. Amaze your friends and yourself with the