Successful Teacher enhances, encourages and helps to develop the students' creative thinking, methods of teaching and democratic environment increase the students ability of creative thinking, as what previous several studies which showed that the moderate school environment leads to the availability characteristics of creativeness, such as extroversion, enthusiasm, emotional equilibrium of the instructor, and the ability to enhance creative thinking among students. The study aimed to investigate the roles of mathematics teachers in improving creative thinking, and it is restricted to a high school math teachers’ role of creative thinking abilities associated with fluency, originality, flexibility, explanations And their ability to support those skills in the classroom, researchers suggested a list of themes improving creative thinking abilities, the following main three themes; Asking questions, Teacher’s response, and Building an exciting environment. To achieve these goals for the current study, the researcher limited the study on develop methods of evaluating, a suggested methods of teaching for in service teachers' to improve their performance and their creative thinking abilities by the diversity of teaching methods such as using open-end divergent questions, motivational questions, and brainstorming.