Naja F, Sao S. Peningkatan Berpikir Matematis Siswa Sekolah Dasar Melalui Implementasi Model Problem Based Learning. cendekia [Internet]. 18May2024 [cited 2May2026];8(2):1049-5. Available from: https://j-cup.org/index.php/cendekia/article/view/3124