Abstract: Subject quality is a very important index for the implementation of quality education and the development of international education evaluation. Core quality is the foundation and core of realizing the educational value and establishing the quality standard of talents in our country. Therefore, in junior middle school mathematics teaching, it is necessary to attach great importance to the cultivation of students' core qualities and improve the efficiency and quality of classroom teaching through the explanation of typical cases.

Key words: Junior high school mathematics, Core literacy, Typical cases