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The purpose of the research in the study was to study the development of learning discovery-based pocket book media on students' mathematical understanding abilities. The research methodology used is the method of research and development (R & D). Based on the results of development, research, and discussion, it can be concluded that the development of learning discovery-based pocket book media on mathematical understanding skills reaches a level of validity with excellent categories anddoi:10.30998/sap.v3i3.3586 fatcat:fr5gjwdwwrbrhm7w4k4b3spmem