This study aims to produce learning media in the form of Student Worksheets material for building space on ethnomathematics-based dongkal cakes. The research method used is a research and development method according to borg and gall. The results of the validation test by material experts obtained a percentage of scores of 95% with very decent criteria, a percentage of scores by media experts of 68% with fairly decent criteria and a percentage of teacher assessment of 82% with decent criteria. As well as the practicality test results obtained on average by 90% with very practical criteria. Based on the results of the validation, this Student Worksheet (LKS) is declared feasible and practical to be used as a learning medium.

Abstrak: Penelitian ini bertujuan menghasilkan media pembelajaran berupa Lembar Kerja Siswa materi bangun ruang pada kue dongkal berbasis etnomatematika. Metode penelitian yang digunakan adalah metode penelitian dan pengembangan menurut borg and gall. Hasil uji validasi oleh ahli materi diperoleh persentase nilai sebesar 95% dengan kriteria sangat layak, persentase nilai oleh ahli media sebesar 68% dengan kriteria cukup layak dan persentase penilaian guru sebesar 82% dengan kriteria layak. Serta hasil uji kepraktisan diperoleh rata-rata sebesar 90% dengan kriteria sangat praktis. Berdasarkan hasil validasi tersebut, Lembar Kerja Siswa (LKS) ini dinyatakan layak dan praktis untukdigunakan sebagai media pembelajaran.