Piaget’s Cognitive Theory in Upper Primary School Students’ Mathematical Problem Solving: A Literature Review. Circle: Jurnal Pendidikan Matematika, [S. l.], v. 6, n. 1, p. 67–77, 2026. DOI: 10.28918/circle.v6i1.2605. Disponível em: https://e-journal.uingusdur.ac.id/circle/article/view/circle612605. Acesso em: 20 aug. 2026.