This study aimed to improve students’ learning outcomes in Natural Science through the implementation of the Snowball Throwing cooperative learning model among third-grade students at SDS Muhammadiyah Sambirejo. The study employed Classroom Action Research conducted in two cycles, with each cycle consisting of planning, action, observation, and reflection. The participants were 20 third-grade students. Data were collected using observation sheets and learning achievement tests. The results showed that in Cycle I, 1 student (5%) was categorized as poor, 14 students (70%) as sufficient, and 5 students (25%) as good, with a classical learning achievement percentage of 61%. This result had not yet reached the predetermined success indicator of 70%. After improvements were implemented in Cycle II, 6 students (30%) achieved the good category and 14 students (70%) achieved the very good category, with an average class score of 81.5 and classical mastery reaching 86%. Therefore, the Snowball Throwing cooperative learning model was effective in improving the Natural Science learning outcomes of third-grade students at SDS Muhammadiyah Sambirejo.
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