Ⅰ Factorization

1.
factorization
2.
Greatest common divisor and least common multiple
The grand finale

Ⅱ Integers and rational numbers

1.
Integers and rational numbers
2.
Addition and subtraction of rational numbers
3.
Multiplication and division of rational numbers
The grand finale

Ⅲ Letters and Expressions

1.
Use of characters and calculation of expressions
2.
First-order equations and their calculations
3.
linear equation
The grand finale

Ⅳ Coordinate plane and graph

1.
Coordinate plane and graph
2.
Direct and inverse proportions
The grand finale