. S, Nengah Parta I, Puspitasari L. Efforts to Build Students’ Mathematical Problem-solving Ability Through Problem-based Learning Models on Number Operation Materials in Class VII SMPN 25 Malang. KSS [Internet]. 2023 Jun. 5 [cited 2025 Dec. 2];8(10):309–317. Available from: https://knepublishing.com/index.php/KnE-Social/article/view/13456