RATTI, R. Penerapan Model PBL Untuk Meningkatkan Kemampuan Operasi Hitung Penjumlahan Dan Pengurangan Siswa Kelas I: Application of the PBL Model to improve the ability of Addition and Subtraction Count Operations for Class I students. Neraca: Jurnal Pendidikan Ekonomi, [S. l.], v. 6, n. 2, p. 42–49, 2021. DOI: 10.33084/neraca.v6i2.2643. Disponível em: https://journal.umpr.ac.id/index.php/neraca/article/view/2643. Acesso em: 22 jul. 2024.