RATNA, Ratna. Penerapan Penerapan Model Problem Based Learning untuk Meningkatkan Hasil Belajar Matematika Materi Pokok Penjumlahan dan Pengurangan Bilangan Desimal. Cokroaminoto Journal of Primary Education, [S. l.], v. 4, n. 2, p. 102–110, 2021. DOI: 10.30605/cjpe.4.2.2021.1431. Disponível em: https://www.e-journal.my.id/cjpe/article/view/1431. Acesso em: 3 aug. 2025.