DEVELOPING COMMUNICATION AND PROBLEM SOLVING IN ELEMENTARY SCHOOL MATHEMATICS LEARNING THROUGH PROJECT-BASED LEARNING. PIONIR: JURNAL PENDIDIKAN, [S. l.], v. 15, n. 1, p. 155–167, 2026. DOI: 10.22373/pjp.v15i1.34203. Disponível em: https://jurnal.ar-raniry.ac.id/index.php/Pionir/article/view/34203. Acesso em: 14 may. 2026.