This study is aimed to develop mathematics learning media inspired by the typical games of the coastal communities of Sumenep Madura Regency. We provide the media with "Thong-Bhitongan" which is defined as a counting tool in Indonesian. This development uses a development design adapted from Thiagarajan, which consists of a definition, design, and development. "Thong-Bhitongan" is a concrete media that students can play with. The validation results of the "Thong-Bhitongan" media were 82.5, and the material validation was 85. Product trials were carried out at three target schools of Kampus Mengajar 4: Duko II Elementary School, Guluk-guluk II Elementary School, and Guluk-guluk IV Elementary School. The results of the product trials showed that the "Thong-Bhitongan" learning media developed was effective in helping to increase students' understanding of numeracy material, as evidenced by the post-test results which were better than the pre-test results and had exceeded the minimum completeness score. In addition, the media "Thong-Bhitongan" also achieved a good response from students. It is expected that the product of this research, namely the mathematics learning media "Thong-Bhitongan" will become an alternative medium in improving students' nomural abilities.
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