“PENGARUH LKPD BERBASIS PROBLEM BASED LEARNING BERMUATAN BUDAYA BATAK TERHADAP KEMAMPUAN BERPIKIR KRITIS MATEMATIS SISWA DI SMAN 1 AIR PUTIH” (2026) JOURNAL OF SCIENCE AND SOCIAL RESEARCH, 9(3), pp. 3140–3146. doi:10.54314/jssr.v9i3.6378.