TY - JOUR AU - Sripanlum, Jutatip AU - Nontapa, Navapon PY - 2022/05/14 Y2 - 2024/03/29 TI - The Development of Mathematical Problem-Solving AbilityUsing Discovery Learning for Mathayom Suksa 5 Students JF - Journal of Education Rajabhat Maha Sarakham University JA - edu-rmu VL - 19 IS - 1 SE - Research Articles DO - UR - https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/256454 SP - 95-104 AB - <p>This study was action research, and the purpose of this study was to improve mathematical problem-solving ability using the discovery learning method to achieve the average score of 60% for MathayomSuksa 5 Students. The participants were 31 students from Mathayom Suksa 5 in a classroom of 5/5 at Mahasarakham University Demonstration School (Secondary).The research tools were lesson plans focused on the discovery learning method with a total of 12 plans, a mathematical problem-solving test with 5 questions, and semi-structured interview with five items concerning basic counting principle for Mathayom Suksa 5 students. Percentage, mean, and standard deviation were used to analyze the data.</p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The results of the research revealed that (1)the students’ overall mathematics ability in problem-solving was at “Good Level”. According to the interviews after math problem-solving activities in each operating cycle, the findings indicated that students were able to identify the questions and the answers, devise a problem-solving plan, solve the math problems with fewer errors, and recheck the answers accurately.Furthermore,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;(2) after the instruction by using the discovery learning approach, the student’s ability on mathematical problem-solving was exceeded the standard of 60%.</p> ER -