The nine chapters on arithmetic are very rich in content. In the form of problem sets, the book contains 246 applied questions related to production and life practice, in which each question has questions (questions), answers (answers) and skills (steps to solve problems, but there is no proof), some have one skill for one question, and some have many skills for many questions. According to their nature and solutions, these problems belong to the following nine chapters: millet, decline (Cui), Shaoguang, work, equal loss, profit and loss, equation and Pythagorean. The original edition has illustrations, and this edition only leaves the text.

There are 246 math problems in Nine Chapters Arithmetic, which are divided into nine chapters. Its main contents are as follows:

Chapter 1 "Square field": calculation of field area; Area formulas of various polygons, circles, arches, etc. It's all been brought up. The complete rules of general division, subtraction, addition, subtraction, multiplication and division of fractions. The latter is 1400 years earlier than Europe.

Chapter two "millet": conversion of grain proportion; Propose a proportional algorithm, which is called the prior art; The law of proportional distribution was put forward in the chapter of decay, which is called decay class;

Chapter 3 "Decline": the problem of proportional distribution; This paper introduces the method of square root and square root, and its steps are basically the same as today. This is the earliest multi-digit and fractional root rule in the world. It laid a foundation for China to lead the world in numerical solution of higher order equations for a long time. The fourth chapter is "less but wider": knowing the area and volume, the length of one side and the length of the diameter are calculated backwards;

Chapter 5 "commercial engineering": geotechnical engineering and volume calculation; In addition to various solid volume formulas, there are also engineering allocation methods;

sequence