Magic Mathematics in Life: The simplest thinking algorithm in the world will immediately make you think like a mathematical genius. Get ready to surprise your friends, including yourself, with your amazing speed! In this book, the author will separate the secrets of lightning-fast mental arithmetic and amazing digital know-how from you. Through this book, you will soon learn mental arithmetic, faster than you think! In addition, your digital memory ability will be greatly improved. Perhaps this is the first time you feel that the digital world is so enjoyable. This book will make it easy for you to show your amazing math skills. The mathematical knowledge in this book is something you will never learn in school.