Ⅰ Factorization

Lesson 1: Prime and Composite Numbers / Lesson 2: Factoring Prime Numbers / Lesson 3: Finding the Greatest Common Divisor / Lesson 4: Finding the Least Common Multiple

Ⅱ Integers and Rational Numbers⑴

Lesson 5: The Meaning of Integers and Rational Numbers / Lesson 6: Absolute Value and Size

Ⅱ Integers and rational numbers⑵

Lesson 7: Addition of Rational Numbers / Lesson 8: Subtraction of Rational Numbers / Lesson 9: Multiplication of Rational Numbers ⑴
Lesson 10 Multiplication of Rational Numbers ⑵ / Lesson 11 Division of Rational Numbers

Ⅲ Letters and Expressions

Lesson 12: Use of letters and values ​​of expressions / Lesson 13: Polynomials / Lesson 14: Calculating linear equations

Ⅳ Linear equation

Lesson 15: Equations and Identities / Lesson 16: Solving Linear Equations / Lesson 17: Applications of Linear Equations

V Coordinate plane and graph

Lesson 18: Coordinate Plane and Graphs / Lesson 19: Direct Proportion / Lesson 20: Inverse Proportion

The core concepts of first-semester middle school mathematics are divided into 20 lectures to enable quick and accurate learning, and concepts are repeatedly confirmed through twin problems.
We also provided examples of incorrect answers to help you review concepts that are easy to confuse or mistakes that are often made.