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"Those who can do quick calculations will never be too bad in life" introduces the use of quick calculations in the field of mathematics in a novel and entertaining way. By establishing a special relationship between numbers, it can perform faster addition, subtraction, multiplication and division operations. "Those who can calculate quickly will never be too bad in life" uses a novel, interesting and practical way to teach us how to add, subtract, multiply and divide quickly and accurately, making mathematical operations simple, fast and efficient. When reading the whole book, there is no sense of obscurity. On the contrary, it makes people want to stop. They want to read the whole book at once and master all the effective and technical calculation methods. "Those who can calculate quickly will never be too bad in life" This book is very practical, interesting, and operable. The calculation methods introduced can not only be applied to practical work to improve calculation speed and accuracy, but also allow readers to experience wonderful arithmetic operations and exercise logical thinking skills.