. M. Peningkatan Kemampuan Pemahaman Matematis Siswa Sekolah Menengah Pertama Melalui Problem Based Learning (PBL) Dan Direct Instruction (DI). PJME [Internet]. 2020 Apr. 30 [cited 2025 May 4];5(1). Available from: https://www.journal.unpas.ac.id/index.php/pjme/article/view/2516