SIRAGIH, Hermita Tri Indah; SARAGIH, Mery Chris Isabella; SIABUTAR, Melisa Nur Asima. Analysis of Students’ Difficulties in Understanding the Concept of Summation in Grade II Students of UPTD State Elementary School 124407 Pematangsiantar. JPG: Jurnal Pendidikan Guru, [S. l.], v. 7, n. 4, p. 711–718, 2026. DOI: 10.32832/jpg.v7i4.25450. Disponível em: https://ejournal.uika-bogor.ac.id/index.php/jpg/article/view/25450. Acesso em: 2 nov. 2026.