@article{Sripanlum_Nontapa_2022, place={Bangkok, Thailand}, title={The Development of Mathematical Problem-Solving AbilityUsing Discovery Learning for Mathayom Suksa 5 Students}, volume={19}, url={https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/256454}, abstractNote={<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>                 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,                 (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>}, number={1}, journal={Journal of Education Rajabhat Maha Sarakham University}, author={Sripanlum, Jutatip and Nontapa, Navapon}, year={2022}, month={May}, pages={95–104} }