https://cosmos.iaisambas.ac.id/index.php/cms <p><strong>COSMOS: Jurnal Ilmu Pendidikan, Ekonomi dan Teknologi</strong> provides direct open access to its content with the principle that making research freely available to the public supports greater global knowledge exchange. All articles published under Open Access will be immediately and permanently free to read and accessible to everyone.</p> <p><strong>COSMOS: Jurnal Ilmu Pendidikan, Ekonomi dan Teknologi</strong> encompasses research and studies in the fields of education and culture, the entire spectrum of economics, and the science of development utilizing technology across various disciplines.</p> <p><strong>COSMOS: Jurnal Ilmu Pendidikan, Ekonomi dan Teknologi</strong> will be published 6 times a year, with a maximum of 10 manuscripts per issue, comprising 3 manuscripts in Indonesian and 7 manuscripts in English.</p> PUSDATIN Institut Agama Islam Sultan Muhammad Syafiuddin Sambas en-US COSMOS: Jurnal Ilmu Pendidikan, Ekonomi dan Teknologi 3046-4846 https://cosmos.iaisambas.ac.id/index.php/cms/article/view/376 This research aims to explore the ethnomathematical practices of the Dayak community in West Kalimantan and their potential for integration into education and local economic empowerment. The study is based on the view that mathematics exists not only in the classroom but is also embedded in everyday cultural activities. Using an explorative qualitative approach, data were collected through participatory observation, in-depth interviews, documentation studies, and literature reviews. The results indicate that in entrepreneurial activities, traditional crafts, and natural resource management, the Dayak community applies contextual mathematical principles such as ratios, geometric patterns, and ecological time calculations. This finding reinforces that local knowledge contains mathematical values that can be utilized as a contextual learning resource in schools. In conclusion, ethnomathematics serves not only as a bridge between culture and science but also as a strategy for sustainable education and economic development. This study recommends the development of ethnomathematics learning models, integration into the curriculum, and training for entrepreneurship, local culture-based industries, and sustainable natural resource management. Sudiansyah Sudiansyah Rostina Rostina Simin Simin Dian Kurnianto Heriyanto Heriyanto Copyright (c) 2025 COSMOS: Jurnal Ilmu Pendidikan, Ekonomi dan Teknologi https://creativecommons.org/licenses/by-nc-sa/4.0 2025-10-13 2025-10-13 2 6 1324 1342 https://cosmos.iaisambas.ac.id/index.php/cms/article/view/377 This study aims to formulate the institutional transformation of the Sandai Sub-district PGRI (Teachers' Association of the Republic of Indonesia) for the 2025–2030 term, focusing on strengthening its role as a professional teachers' organization in a rural region. The research is grounded in the necessity for teacher organizations to address structural educational challenges in 3T (underdeveloped, frontier, and outermost) regions through a vision, mission, and work programs that are contextually relevant and grounded in local culture. Using a descriptive qualitative approach, data were collected through in-depth interviews, participatory observation, and document analysis involving PGRI administrators, teachers, principals, and education officials. The findings indicate that the institutional transformation of Sandai PGRI is characterized by the strengthening of an inclusive vision, reflective training, the development of learning communities, and advocacy for teacher welfare and professional ethics. These findings affirm PGRI's strategic position as a bridge between national policies and local needs. The implications suggest that the organization must develop a leadership succession (cadre) system, broaden cross-sectoral partnerships, and enhance training grounded in Dayak-Malay cultural values. In conclusion, the Sandai PGRI is positioned to become a model for a progressive, context-aware, and equitable professional teachers' organization, spearheading educational transformation at the local level. Sudiansyah Sudiansyah Siswanto Siswanto Jumadi Jumadi Stepanus Henny Ahmad Bahroyni Juhana Juhana Rosnawati Rosnawati Copyright (c) 2025 COSMOS: Jurnal Ilmu Pendidikan, Ekonomi dan Teknologi https://creativecommons.org/licenses/by-nc-sa/4.0 2025-10-13 2025-10-13 2 6 1343 1360