Sembiring, Iga Marisa, Ahmad Landong, Rizky Ananda Hafit, Ira Amalia Siregar, Laila Sari Pohan, and Gilda Hanum. 2023. “Pengembangan Bahan Ajar Matematika Materi Bilangan Bulat Menggunakan Model Pbl Terhadap Minat Belajar Siswa Kelas IV SD”. Innovative: Journal Of Social Science Research 3 (2):12827-37. https://j-innovative.org/index.php/Innovative/article/view/1834.