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The aims of this research is to know effect of learning device based on CORE models (Connecting, Organizing, Reflecting, and Extending) to mathematical problem solving ability at the level of junior high. This research is a quasi experimental with subject of students class VIII SMPN 12 Padang. The instrument used is test and analysis using t-test. The results of this research showing that the learning device based on CORE models have an effect to the mathematical problem solving ability of the students. Keywords— Learning device, CORE Models, Problem Solving Ability

The Influence of Learning Device with Core Model to Improve Problem Solving Ability of Student Class VIII of Junior High School