The Bojong Village is one of the villages in Parigi Sub-district, Pangandaran Regency, which has a variety of promising local potentials. Currently, Bojong Village is one of the supporters of the natural tourism sector that supports the world of local-based tourism. However, from a socio-cultural point of view, the community in Bojong Village does not know the history of the village's development in the past, making it difficult for the community to determine the village's anniversary. So that social cohesion is minimally built and it is feared that it will trigger division. The service method carried out in this service was carried out through the participatory action research (PAR) method. The results of the service concluded that the determination of the village anniversary was successfully carried out through several stages, namely: cross-history search, symposium, and panel discussion between figures. Therefore, community development based on local wisdom in the context of determining the anniversary of Bojong Village can be said to be successfully carried out. The results of the service led to the establishment of the anniversary of Bojong Village, a memorandum of understanding of the anniversary of Bojong Village signed by the leaders, and a small book of resume of the history of Bojong Village. The implication of this service is the existence of a village regulation related to the determination of the anniversary of Bojong Village.

Difficulty of students in understanding the material, as well as the difficulty of teachers to explain the material in the process of learning Mathematics due to the use of learning media or limited teaching materials, in addition to the lack of use of digital learning media that varies resulted in the learning process of mathematics performed by teachers with students is less than maximum. The research is aimed at developing interactive digital media based on E-Book on Class IV Mathematics subjects, using the Borg and Gall model research and development (R&D) method modified by Sugiyono to solve problems as well as to be an alternative for teachers and students in the learning process of mathematics in SD and to know the validity of products that have been developed through the Stage of Material Validation and Media validation. The Borg and Gall model, modified by Sugiyono, consists of five stages of development: potential and problems, information collection, product design, design validation, and design revision