H. B. Saputro and A. N. . Hidayati, “The effect of using korong calculating media on problem solving ability in calculating operations of multiple class II students of SD Muhammadiyah Klepu”, J. Math Educ. Nusant. Wahana Publ. Karya Tulis Ilm. di Bid. Pendidik. Mat., vol. 10, no. 1, pp. 41–54, May 2024.