Mathematics - The Art of Mental Calculation (Ebook & Audio)

Dr. Benjamin is one of the world’s fastest lightning calculators, and he can demonstrate and explain his abilities to any audience. Among the many feats of mind demonstrated: How to mentally multiply enormous numbers (faster than a calculator); How to memorize a 100 digit number; How to figure the day of the week of anyone’s birthday, and more! Dr. Benjamin offers a variety of presentations, suitable for schools, conferences, corporate events, and private functions.