The Effect of Implementing CTL and PBL Models on Students’ Mathematical Problem-Solving Ability. Riemann: Research of Mathematics and Mathematics Education, [S. l.], v. 7, n. 1, p. 88–94, 2025. DOI: 10.38114/reimann.v7i1.47. Disponível em: https://journal.sanagustin.ac.id/index.php/reimann/article/view/47.. Acesso em: 24 mar. 2026.