02. Mental Addition and Subtraction.avi

Mathemagic by Arthur Benjamin



Dr. Benjamin shares all of his secrets of doing mental math faster than a calculator in his Mathemagics course. The course consists of three DVDs and an audio disk, along with an autographed copy of his book, Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks. (The book is co-written with Michael Shermer and has a foreword by Bill Nye, the Science Guy.) The cost of the course is $49 (or $39 without the book) plus tax, shipping, and handling. Credit card and Paypal orders are accepted.



https://www.math.hmc.edu/~benjamin/mathemagics/store.html