243. Penerapan Model Problem Based Learning dalam Meningkatkan Hasil Belajar Matematika Peserta Didik Kelas 1 SDN Pati Lor 05 Berbantuan Media Counting Box. psnppg. 2023;1(1):2161-2170. Accessed August 11, 2026. https://conference.upgris.ac.id/index.php/psnppg/article/view/4309