Kangaroo on the chessboard as a didactic tool. Elementary Mathematics Education Journal, [S. l.], v. 3, n. 2, 2021. DOI: 10.5507/emej2021-3-2-445. Disponível em: https://journals.upol.cz/EMEJ/article/view/445. Acesso em: 14 jun. 2026.