Setianingsih, S.; Arofah, F. A.; Suyono, S.; Pristiani, R. Concrete-to-Abstract Transitions and Affective Factors in Fourth-Grade Mathematics: A Systematic Review of Pedagogical Challenges and Merdeka Curriculum Implementation. J. Rev. Pendidik. Dasar : J. Kaji. Pendidik. dan Has. Penelit. 2026, 12, 32-58.