Harini, E., Nurul Islamia , A., Kusumaningrum, B. and Singgih Kuncoro, K. 2023. Effectiveness of E-Worksheets on Problem-Solving Skills: A Study of Students’ Self-Directed Learning in the Topic of Ratios. International Journal of Mathematics and Mathematics Education. 1, 2 (Jun. 2023), 150–162. DOI:https://doi.org/10.56855/ijmme.v1i02.333.