313. Peningkatan Hasil Belajar Matematika Melalui Model Problem Based Learning Berbantuan Alat Peraga Siswa Kelas 4 SD. psnppg. 2023;1(1):2797-2806. Accessed August 12, 2026. https://conference.upgris.ac.id/index.php/psnppg/article/view/4131