Many students face academic engagement and achievement challenges due to the lack of culturally relevant instructional materials. This study examines the effectiveness of integrating Culturally Responsive Teaching (CRT) with Problem-Based Learning (PBL), supported by Quizizz, in improving student learning outcomes in Science and Social Studies (IPAS). Conducted as a Classroom Action Research (CAR) study using Stringer's model, the research involved two cycles with 28 fourth-grade students at SDN Empang 2 Bogor. Data collection methods included classroom observations, formative assessments, and student performance analysis. The findings indicate a significant improvement in student learning outcomes, with average scores increasing from 67 in Cycle 1 to 80 in Cycle 2. The proportion of students meeting the minimum competency threshold rose from 46% to 75%. A paired t-test confirmed that these improvements were statistically significant (p < 0.05, Cohen's d = 1.18), indicating a strong effect of the CRT-PBL model. Integrating culturally relevant content, problem-solving strategies, and gamified assessment through Quizizz enhanced student engagement, motivation, and conceptual understanding. This study highlights the potential of CRT-PBL combined with educational technology to foster active learning in diverse classrooms. Future research should explore its long-term impact and applicability across different subjects and educational settings.