by Willem Bouman (Author)

Discover the world of numbers with one of world's best and fastest mental calculators, Willem Bouman. Mental calculation is a skill, and this means that significant progress can be made by practice. In this book you'll read about theories and principles aimed at guiding your practice and enriching your insight into numbers. As your training progresses you'll gain confidence in your own skills and you will be able to make impressive calculations, purely mentally, regardless of your background.