<![CDATA[This research was motivated by problems in grade VIII of SMP Negeri 8 Bukittinggi. From the results of observations and interviews, it was obtained that there is a lack of student mathematics learning activities, students' ability to solve math problems is still low, and learning is still teacher-centered. One alternative to overcome this problem is to apply the CORE learning model. This study aims to determine student learning activities in mathematics learning using the CORE learning model, and to determine students' mathematical problem solving abilities using the CORE learning model better than conventional learning. This type of research is a pre-experiment with The Static Group Comparison research design. The population in this study was all grade VIII students of SMP Negeri 8 Bukittinggi with a total of 5 classes. The sample of this study is class VIII.5 as an experimental class and class VIII.3 as a control class. The instruments used in the study were observation sheets of student learning activities and final tests of mathematical problem solving abilities. The data obtained from this study showed that (1) student learning activities in mathematics learning using the CORE learning model reached a level of 74%, which was classified as active, and (2) students' mathematical problem solving ability using the CORE learning model was better than students who followed conventional learning.]]>
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