1, number. Refers to the expansion from natural numbers to real numbers, mainly in the first day of junior high school, in which the first book begins with rational numbers and the second book begins with irrational numbers;

2. Formula, that is, algebraic formula. The first grade will learn algebraic expressions, the second grade will be divided into classes, and the third grade will be divided into two classes. Of course, algebraic operations, such as factorization (in the second day of junior high school) should also be included in this part;

3. Equations and inequalities. The first volume of the first day of junior high school learns the linear equation of one yuan, and the second volume (group) learns the linear equation of two yuan and linear inequality; Learning fractional equation in the second day of junior high school; Learn one yuan twice in the third grade;

4. Function. Learn a function in Grade Two, an inverse proportional function in Grade Two and a quadratic function in Grade Three.

5. geometry. Basic knowledge of geometry in senior one, triangle congruent triangles, special triangle, parallelogram in senior two, and circle in senior three.

6, statistics and probability, etc. It is also scattered in all grades and studied alone. Such as bar chart, fan chart, variance and median pattern, the probability is in grade two or three.

Called Fish Science (Xuewang Station) thinks that junior high school mathematics is the key period to lay a good foundation, so we must pay attention to it.