“ANALYZING STUDENTS’ UNDERSTANDING OF MATHEMATICAL CONCEPT ABOUT TWO-DIMENSIONAL FIGURES AT GRADE III OF ELEMENTARY SCHOOLS IN SERANG”. Primary: Jurnal Pendidikan Guru Sekolah Dasar 10, no. 5 (October 27, 2021): 1142–1151. Accessed December 17, 2025. https://primary.ejournal.unri.ac.id/index.php/JPFKIP/article/view/741.