Ethnomathematics is one of the approaches that integrates local wisdom with mathematics learning. This study aims to develop PBL-based LKPD with ethnomathematics nuances at the Maimun Palace. This research method is research and development (Research and Development). The development model used as the basis for this study is the ADDIE development model (Analysis, Design, Development, Implementation and Evaluation). The results of the study showed that the LKPD developed was included in the valid category, for the average overall result of the LKPD validation assessment from the three validators was 4.35. In the implementation, the response of students to the LKPD with an average score of 4.48 was categorized as very good and met the practicality of the LKPD, so it did not need to be revised again. The PBL-based LKPD with ethnomathematics nuances produced, along with its supporting instruments, have met the criteria of validity, practicality, and effectiveness.

This study examines ethnomathematics in traditional tools of the Malay ethnic group at the North Sumatra Provincial Museum, encompassing ceremonial and livelihood tools. The research employs a qualitative approach using ethnographic methods to explore the mathematical concepts embedded in these objects. Ceremonial tools such as bentan, tiered trays, incense burners, and glass holders were analyzed based on geometric concepts such as circles, cylinders, ratios, and sequences, while livelihood tools such as goat hoofs, horns, sickle, and one-sided fish traps represent spatial geometry, symmetry, and volume concepts. The findings reveal that these traditional objects not only serve practical purposes but also contain mathematical and philosophical values reflecting Malay culture. These tools can be utilized as context-based mathematics learning media, helping students understand mathematics through the lens of local culture. This study emphasizes the significant role of ethnomathematics in integrating education with cultural preservation while strengthening local identity in the era of globalization.