The research problem is the low problem-solving ability and collaboration skills of students, caused by abstract and passive learning methods, as well as the lack of varied learning models. The study aims to address this issue using the SABUMI model. The objectives are to describe and analyze improvements in problem-solving skills, and collaboration abilities. This research employs Classroom Action Research (CAR) with 10 fifth-grade students from SDN Terantang 2, Barito Kuala Regency, using both qualitative and quantitative approaches. The results showed that problem-solving ability increased from 60% with the criteria of "quite skilled" to 90% with the criteria of "very skilled". Cooperation skills also increased from 30% with the criteria of "quite skilled" to 90% with the criteria of "very skilled". The findings conclude that the SABUMI model effectively enhances students' problem-solving abilities and collaboration skills in learning Simple Equations. Therefore, it is recommended as an alternative teaching approach for this topic.
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