Özet:

We were forced to transition to distant education for a while in our nation as well as other countries because to the Covid-19 outbreak that happened and is still ongoing in the process we are in. Numerous learning searches were created for students to utilize in and out of the classroom throughout the distance education era. For this reason, it was intended to create a mobile application within the constraints of the ADDIE design paradigm that would be used in the Geometry and Measurement learning area courses of the 7th grade mathematics course. The built in mobile application's content included interactive exercises that students could use. This study was carried out in the distance education process with 7th grade students in a secondary school in the Central Anatolia region in the 2nd semester of the 2020-2021 academic year. The research was conducted using a quasi-experimental methodology. The "Spatial Relationship Test" was used to examine the experimental procedure's findings. The t-test for unrelated samples and the t-test for related samples were used to analyse the test data. Data analysis revealed that the experimental group's final application scores for spatial relations were significantly different from those of the control group, which received textbook-based training instead of mobile application-assisted instruction. The experimental group students' pre-application and post-application scores significantly differed from those of the control group students, but not the other way around. The result of the study concluded that the mobile application supported the development of students' spatial skills. Additionally, it has been suggested that students will benefit from mobile applications that take students' spatial abilities into account while designing them.

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