Hello, I'm glad to answer your question. Mathematical algebra in junior high school includes: rational numbers, addition and subtraction of algebraic expressions, quadratic equations with one variable, linear equations with one variable, linear equations with two variables, exponential powers, quadratic roots and fractional equations of algebraic expressions. Mathematical geometry in junior middle school includes: triangle, congruent triangles, axisymmetry, Pythagorean theorem, parallelogram, linear function, quadratic function, circle, inverse proportional function, trigonometric function, statistics and probability.