Phongsaphat Kingphet และ Pawarit Nuntharatkul; Kanitha Chaowatthanakun. (2025) A Comparative Study of Mathematical Problem-Solving Skills Using Cooperative Learning with the Think-Pair-Share Technique and Cooperative Learning with the Group Investigation (GI) Technique Among Mathayomsuksa 1 students. <i>Journal of Science and Science Education</i>, <i>8</i>(1), 67-80.Phongsaphat Kingphet และ Pawarit Nuntharatkul; Kanitha Chaowatthanakun. "A Comparative Study of Mathematical Problem-Solving Skills Using Cooperative Learning with the Think-Pair-Share Technique and Cooperative Learning with the Group Investigation (GI) Technique Among Mathayomsuksa 1 students". Journal of Science and Science Education 8 (2025):67-80.Phongsaphat Kingphet และ Pawarit Nuntharatkul; Kanitha Chaowatthanakun. A Comparative Study of Mathematical Problem-Solving Skills Using Cooperative Learning with the Think-Pair-Share Technique and Cooperative Learning with the Group Investigation (GI) Technique Among Mathayomsuksa 1 students. Faculty of Science, Ubon Ratchathani University:ม.ป.ท. 2025.