This research is motivated by the low mathematics learning outcomes of students. The study aims to improve the mathematics learning outcomes of students by implementing differentiated learning using the Problem-Based Learning model in Class IV of SDN 19 Jambi. This study is a Classroom Action Research consisting of two cycles. Based on the observation results of teacher activities in Cycle I, 78% were categorized as good, and in Cycle II, it increased to 85%. Based on the research data, the test results in the form of evaluation questions to determine student learning outcomes in Cycle I were 57%, and in Cycle II, it increased to 76%. Therefore, it can be concluded that the implementation of differentiated learning using the Problem-Based Learning model can improve the mathematics learning outcomes of Class IV SDN 19 Jambi.
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