Turro IRK, Giducos RM. Development and Validation of Manipulatives in Teaching Mathematics 6 . Rand. Inter. Edu. Ling. Sci. J. [Internet]. 2025Jun.30 [cited 2026Apr.18];6(2):479-95. Available from: https://randwickresearch.com/index.php/rielsj/article/view/1163