Development of discovery learning-based worksheets assisted by GeoGebra to improve students’ mathematical reasoning

Students' mathematical reasoning skills are still low. Topic that are considered difficult by students is geometry. In order for geometry learning to be meaningful, mathematical objects need to be visualized. GeoGebra is one of the dynamic and interactive software that can help students in exploring mathematical concepts. For this reason, it is necessary to create GeoGebra-assisted worksheets. The purpose of this research is to produce a worksheet with a discovery learning model assisted by GeoGebra that is valid, practical, and effective to improve students' mathematical reasoning. This research is a development research with three main phases: preliminary research, prototyping phase, and assessment phase. The subjects in this study were 26 students of grade VIII of junior high school. Data were obtained through interviews, observation sheets, and mathematical reasoning ability tests. The data were analyzed descriptively and using dependent t-test. The results showed that the discovery learning worksheet assisted by GeoGebra was valid, practical, and effective. The worksheet is easy for students to use and understand and is interesting for students. The worksheet has a positive impact on the development of students' mathematical reasoning skills.