This book is divided into four chapters, namely the first chapter, rational numbers. Chapter two, addition and subtraction of algebraic expressions. Chapter 3, One-dimensional linear equation. Chapter four, preliminary geometry. Mathematics must be brushed.

Chapter 1: rational numbers, positive and negative numbers, addition and subtraction of rational numbers, experiment and exploration, magic square filling, reading and thinking, multiplication and division of negative numbers and rational numbers, observation and guess, mathematical principles in flop games, powers of rational numbers, mathematical activities, summary and review questions 1.

The second chapter is algebraic addition and subtraction, algebraic expression, reading and thinking, dialogue between number 1 and letter X, algebraic addition and subtraction, application of information technology, spreadsheet and data calculation, mathematical activities, summary and review.

Chapter 3: One-dimensional linear equation, from formula to equation, reading and thinking about the history of "equation", solving one-dimensional linear equation (1)-merging similar terms and shifting terms, experiment and exploration? Infinite cycle fraction, solving linear equation (2)-removing brackets and denominator, practical problems and linear equation, mathematical activities, summary, review question 3.

Chapter IV Elementary Geometry, Geometry, Origin of Reading and Thinking Geometry, Line, Ray, Line Segment, Measurement of Reading and Thinking Length, Angle, Special Study, Design and Manufacture of Cuboid Packaging Carton, Mathematical Activities, Summary and Review Question 4.