Science, Technology, Engineering, and Mathematics-Based Problem-Based Learning Model for Fifth-Grade Students’ Learning Outcomes in Perimeter and Area of Plane Figures. Journal of Basic Education Research, [S. l.], v. 7, n. 3, p. 161–168, 2026. DOI: 10.37251/jber.v7i3.3042. Disponível em: https://cahaya-ic.com/index.php/JBER/article/view/3042. Acesso em: 8 jun. 2026.