About the Book: The book advocates for mastering mental math as a key to success and control in a world full of transactions, from splitting bills and calculating discounts to negotiating deals. It assures readers that mental math isn’t difficult and that the book will teach the simplest, most practical techniques to calculate effortlessly. Specifically, it aims to teach readers how to handle complex everyday math, such as tax, tips, discounts, weights, conversions, and measurements, all without relying on a calculator.