If you want to become expert in math and want to do calculations quickly then this book is for you. To become experts at math, one needs regular practice because mental computation is not done in the same way as pencil-and-paper procedures. There are many ways to add, subtract, multiply, and divide using mental math. There is no one clear-cut method to use in solving a problem, but here I am sharing with you some tricks that can help you and you will enjoy them too.