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The Indonesian language holds a strategic role as a unifying national language as well as the medium of instruction in education. However, this role has not been fully internalized within indigenous communities such as the Baduy Dalam tribe, which is known for its strong adherence to tradition and the use of the Baduy dialect of Sundanese in daily life. This study aims to reveal the role of the Indonesian language in communication and education within the Baduy Dalam community and to analyze how the national language is adopted amidst the strong local culture. This research employs a qualitative method with data collection techniques including in-depth interviews, participatory observation, and document studies conducted within the Baduy Dalam community in Lebak Regency, Banten. The results indicate that the Indonesian language is beginning to be used in educational contexts, especially in formal schools around the Baduy area, although its use remains limited in everyday interactions among community members. Proficiency and understanding of Indonesian are more dominant among the younger generation who receive formal education. The social implications of these findings include the opening of access to broader information and knowledge for the Baduy Dalam people, but also present challenges in preserving local language and cultural values. This study recommends educational approaches based on local wisdom to ensure that the role of the Indonesian language progresses in harmony with the preservation of the Baduy Dalam cultural identity.

Limited access to learning resources appropriate to the local context presents a challenge in the mathematics learning process in indigenous communities such as the Baduy Tribe. Conventional mathematics learning is often considered too abstract and less relevant to the daily lives of Baduy children, especially in the Outer Baduy region. To address this challenge, this community service activity aims to introduce contextual mathematics learning media based on the surrounding environment and local culture. The media developed is designed to be easily accessible, affordable, and environmentally friendly, while still respecting prevailing traditional values. The method used in this activity is Participatory Action Research (PAR), with a collaborative approach between a team of lecturers and the Outer Baduy community. The activity implementation process includes six stages, namely: identification of local problems and potential, planning, designing learning media, implementation, evaluation, and documentation of activity results. The results of the activity show an increase in interest and understanding of basic mathematics concepts among Outer Baduy children. Children appear more active, enthusiastic, and confident in participating in the learning process through educational games and concrete activities. The media used utilizes natural objects and local cultural elements, such as woodcuts, ancient angklungs, traditional hats, and distinctive Baduy woven motifs. The community responded positively because these media do not conflict with traditional values. This activity has had positive cognitive and social impacts and strengthened awareness of the importance of a contextual and culturally based educational approach as a relevant and inclusive learning strategy.