Development of Electronic Student Worksheets (E-Lkpd): Environmental Changes to Train Problem-Solving Skills of Grade X High School Students. JISIP [Internet]. 2026 Nov. 1 [cited 2026 Nov. 3];10(4):2075-87. Available from: https://ejournal.mandalanursa.org/index.php/JISIP/article/view/11280