Loviandari E, Khosiyono BHC, Masjid AA, Nisa AF, Muti’ah T. Mathematics Learning with Concrete Manipulatives among Second-Grade Students at SDN Tridadi: A Perspective on the Concrete Operational Stage. isej [Internet]. 2026Sep.30 [cited 2026Oct.16];7(3):198-12. Available from: https://siducat.org/index.php/isej/article/view/2647