Purba, Rika Wulandari Br, Arcat Arcat, and Lusi Eka Afri. 2025. “The Effect of The Student Facilitator and Explaining Cooperative Learning Model on The Mathematical Problem-Solving Ability of Grade IX Students at Junior High School Tiga Hati Kepenuhan Hulu”. Journal of Biology, Chemistry, Mathematics and Physics Education 2 (2):59-64. https://doi.org/10.61761/biochamp.2.2.59-64.