In this paper, we describe the degree of creativity development of students by using "the sum of the interior angle of the quadrilateral" that is a basic figure as the teaching materials in mathematics education in junior high school grade 2. The experiment was participated by 316 students from junior high school grade 2, senior high school grade 1, second year university students and first year master course students. We set four (4) evaluation viewpoints: divergency, fluency, flexibility and originality to measure a creativity ability test. By using the creativity ability test, we examined the degrees of creativity ability development, the correlation coefficient and the causality relation among the scores of each evaluation viewpoints. The results are as follows: - The higher grade students achieved lower divergency score in the creativity ability test as compared with lower grade students. For instance university students (higher grade students) were compared to senior high school students (lower grade students). On the other hand, senior high school students (higher grade students) were compared to junior high school students (lower grade students). - There were causality relation among the fluency score, flexibility score and originality score in the creativity ability test to all students. For example, the students that got higher originality score achieve higher fluency score and flexibility score. - The higher grade students achieved higher fluency score, flexibility score and originality score in the creativity ability test as compared with lower grade students. However, all students got low originality score in creativity ability test.
