Sitepu ESB, Silalahi TM. PENGARUH MODEL PEMBELAJARAN OPEN ENDED TERHADAP HASIL BELAJAR MATERI PENJUMLAHAN DI KELAS I SD NEGERI 101735 SEI SEMAYANG T.A 2021/2022. sentra [Internet]. 2022 Aug. 28 [cited 2024 Jul. 3];1(1):38-44. Available from: http://e-journal.sari-mutiara.ac.id/index.php/sentra/article/view/3133