<![CDATA[Ethnomathematics studies in Indonesia are still dominated by material cultural artifacts, while oral traditions such as children's songs remain largely unexplored. This study aims to examine mathematical activities in the transmission practice of the song "Lingkaran Kecil Lingkaran Besar" using an exploratory qualitative approach. The research was conducted with 8 main participants who provided exploration worksheets and interview data, 15 supporting participants, and 11 YouTube videos as comparative data. The analysis adapted Braun and Clarke's thematic analysis, which was then interpreted through Bishop's six mathematical activities. The results reveal that the song's lyrics have an initial section that is preserved, though subsequent sections vary. Representations of the song fall into three themes: pig, doll, and movement. Transmission occurs through peers, family, or the school environment. Bishop’s six mathematical activities were identified through the counting of repeated arrays and objects, the designing of structures such as a doll, a pig, and the word "babi" using the numbers 3, 4, 3, and 1. The locating of positions and changes in formation; the measuring of size, distance, tempo, and duration, the explaining of the use of the numbers 6 and 36, and the playing involving the application of game rules and group agreements. These findings emphasize that the song "Lingkaran Kecil Lingkaran Besar" has the potential to be integrated into basic mathematics education to introduce geometry, numbers, and measurement in an enjoyable way while preserving local culture.]]>
