Pasaribu, A.P., Sofnidar and Iriani, D. 2026. The Effect of Gobak Sodor Based Outdoor Learning on Seventh Grade Students Collaborative Character In Algebra. Jurnal Pendidikan Matematika (JPM). 12, 1 (Mar. 2026), 01–13. DOI:https://doi.org/10.33474/jpm.v12i1.24984.