Science learning in elementary schools is often dominated by lecture-based methods, leading to low student engagement and limited conceptual understanding. This issue was identified among 23 fifth-grade students at SDN Dabasah 3 Bondowoso, particularly in the topic of changes in the states of matter. An activity-based science learning approach was implemented, incorporating simple experiments, group discussions, and educational games. Evaluation used pre-tests, post-tests, and Likert-scale questionnaires analyzed descriptively. Results showed significant improvement, with average scores rising from 64.3 to 81.7 (p = 0.001, Cohen's d = 0.82). Students became more actively engaged, confident in expressing opinions, and capable of connecting concepts to real-life phenomena. Activity-based learning effectively enhanced students' cognitive processes, fostering a more meaningful, interactive, and student-centered learning environment.
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