JUIKA, Juika; DEWI, Sinta Verawati; HERYANI, Yeni. Effectiveness of Problem-Based Learning with the Teaching at the Right Level Approach on Students’ Mathematical Concepts Understanding Ability. Kognitif: Jurnal Riset HOTS Pendidikan Matematika, [S. l.], v. 6, n. 1, p. 216–226, 2026. DOI: 10.51574/kognitif.v6i1.3379. Disponível em: https://etdci.org/journal/kognitif/article/view/3379. Acesso em: 22 feb. 2026.