“EFEKTIVITAS MODEL PROBLEM BASED LEARNING DAN DISCOVERY LEARNING BERBANTUAN TANGRAM TERHADAP KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA SISWA SMP” (2019) Prosiding Seminar Nasional Matematika dan Pendidikan Matematika, 4, pp. 379–387. Available at: https://conference.upgris.ac.id/index.php/senatik/article/view/83 (Accessed: 11 August 2026).