ABSTRACT
Rho states in his preface that the science of calculation is so widely employed in scientific studies as well as in people's daily life that it can be called universal. He then goes on to say that though the study of arithmetic was common among his countrymen, those who were poor in memory found it hard to learn. The Napier's rods method was invented to facilitate the study of arithmetic. It was for this purpose that this book was written in Chinese as a new method to help Chinese students.
