Supisara Janpeng และ Chakkrid Klin-eam; Wanintorn Poonpaiboonpipat. (2022) The development of learning activity based on mathematical modeling and gamification technique to promote mathematical problem-solving skill on graph and linear relations for grade-7 students. <i>Journal of Science and Science Education</i>, <i>5</i>(2), 91-103.Supisara Janpeng และ Chakkrid Klin-eam; Wanintorn Poonpaiboonpipat. "The development of learning activity based on mathematical modeling and gamification technique to promote mathematical problem-solving skill on graph and linear relations for grade-7 students". Journal of Science and Science Education 5 (2022):91-103.Supisara Janpeng และ Chakkrid Klin-eam; Wanintorn Poonpaiboonpipat. The development of learning activity based on mathematical modeling and gamification technique to promote mathematical problem-solving skill on graph and linear relations for grade-7 students. Faculty of Science, Ubon Ratchathani University:ม.ป.ท. 2022.