The purpose of this study is to investigate responses or phenomena shown by the students in the process of manipulative activities in order to use manipulatives effectively in the elementary school geometry classes. The fualitative study used for this research analyzed phenomena in the process of learning programs offered to students. The five participants of this research were selected from the third graders at C Elementary School in Seoul city. The researcher recorded all the activities of students, watching them thoroughly and extracting significant statements from each description. These statements were formulated by their meanings, and then those meanings were analyzed into classified themes. The results through this research are as follows: First, previous activities affected later activities positively in the conjoining case, but negatively in the disjoining case and hence it required adventurous thinking. Second, students tried various attempts for solving given problems.