Özet:

During the pandemic phase in our nation, education and training were conducted remotely, as in the rest of the world. Different platforms are now required in the teaching of remote education as a result of this process. For this reason, a mobile application called GeoHepta has been created to be utilized in the ADDIE design model-based Geometry and Measurement learning field subjects course for seventh-grade math students. Dynamic mathematics software was used to provide interactive activities for the built mobile application's content that help pupils. In the second term of the 2020–2021 academic year, the study was conducted via distance learning with 7th graders at a secondary school in the Central Anatolia region. One case study methodology that was used in this study was called "nested single case design". Through self-evaluation forms and interview forms after teaching the subject, qualitative data from all students were gathered during the course implementation phase. The examination of the students' perceptions of the mobile learning process and the researcher's observations made during the application led to the conclusion that the students were enthusiastic, intrigued about using mobile applications, and they had favorable ideas about mathematics. The conclusion has been made that the mobile app is entertaining, catches the user's attention, and the activities help the user comprehend the subjects better. The GeoHepta mobile app created for this subject is just for mathematics lessons for the 7th grade. The development of mobile applications with Turkish user interfaces for various mathematics course topics as well as research projects for both students and teachers' usage are possible in the future. Ethics committee approval dated 19.02.2021 and numbered 2021/50 was obtained from Necmettin Erbakan University Social and Human Sciences Scientific Research Ethics Committee.

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