@article{article_1544499, title={Learning Trajectory of Numerical Problem-Solving Through STEM-Integrated Mathematics: A Didactical Design Research Approach}, journal={Participatory Educational Research}, volume={12}, pages={1–35}, year={2025}, DOI={10.17275/per.25.76.12.6}, author={Guntur, Mochamad and Windari, Puja and Ningsih, Nur Indah Septia}, keywords={Didactical Design Research, Learning Trajectory, Mathematics, Numerical problem-solving, STEM}, abstract={This study aims to investigate students’ learning trajectory while solving comparison problems using the KoPer learning media integrated with STEM, as well as to enhance students’ numerical problem-solving skills. The research involved 27 fifth-grade students from Taman KalijagaPermai Elementary School in Cirebon City. The students are divided into four grup using utilized purposive sampling to form learning groups and conduct numerical problem-solving tests. Students’ learning trajectories were observed through patterns of numerical problem-solving, and the Hypothetical Learning Trajectory (HLT) was employed to develop hypotheses and serve as a research guide. This qualitative study adopted a Didactical Design Research (DDR) approach. Data collection was conducted through interviews, tests, and documentation. The results indicate that creating a good and effective learning design for a STEM-integrated learning trajectory requires effectively combining STEM aspects. During the implementation of the learning trajectory, all groups conducted practical experiments using KoPer integrated with STEM, yielding varied group results, with three groups performing well and two groups not meeting expectations. The numerical problem-solving tests revealed diverse answer patterns among students. These differences represent new findings that are hoped to contribute to future research. Through STEM media, student learning improved, demonstrating that STEM education can stimulate innovation and critical thinking in problem-solving. In conclusion, STEM-integrated numerical problem-solving in mathematics education related to comparisons is significantly effective for practical application in learning.}, number={6}, publisher={Özgen KORKMAZ}