<![CDATA[This study investigates the impact of the cooperative learning model Numbered Heads Together (NHT) combined with interactive learning media on the mathematical problem-solving ability of eighth-grade students. The research aims to address the prevalent low levels of problem-solving competence among students by implementing an innovative student-centered learning approach. Using a quasi-experimental design with a post-test only control group, this study involved two classes selected through random sampling at SMP Negeri 1 Kwandang, with 30 students in each group. The experimental group received the NHT learning model supported by interactive media, while the control group was taught using a direct instruction method with the same media. Data were collected through validated problem-solving tests, analyzed using independent sample t-tests, normality and homogeneity tests, and effect size calculations. The results demonstrated a significant difference between the two groups, with the experimental group achieving higher problem-solving scores (mean score of 32.6 versus 27.9) and a high effect size (Cohen's d = 0.9032). These findings suggest that integrating NHT with interactive learning media effectively enhances students' mathematical problem-solving skills by fostering active engagement, collaboration, and conceptual understanding. The study highlights the importance of adopting interactive, student-centered learning models to improve mathematics education outcomes.]]>
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