“Peningkatan Hasil Belajar Penjumlahan dan Pengurangan Kelas 2 SD Negeri Sawah Besar 01 melalui Problem Based Learning Berbantuan Media Kongkret” (2023), 1(2), pp. 2525–2533. Available at: https://conference.upgris.ac.id/index.php/psnppg/article/view/5409 (Accessed: 12 August 2026).