“Analisis Kesulitan Belajar Operasi Hitung pada Siswa Kelas II SD Negeri 2 Karangan di Klaten” (2024) Mathematical Proceedings of The Widya Mandira Catholic University, 1(1), pp. 142–150. Available at: https://www.journal.unwira.ac.id/index.php/SEMNAPTIKA/article/view/3228 (Accessed: 30 June 2026).