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A person's critical thinking ability in a study field cannot be separated from his understanding on the materials being studied. Therefore, in order that the students are able to think critically in Mathematics, they must understand it well. The purpose of this study is to improve the students' critical thinking and activities in the Mathematics learning using Scientific Approach-based Cognitive Growth model. This is a Classroom Action Research (CAR) study conducted at SMP IT Ihsanul Fikri, Magelang city on the VIIIB class students in the Mathematics subject. The instruments used are observation sheets of student activities, critical thinking skills test sheets, and observation sheets for the implementation of the learning. The percentage of the improvement on the students’ critical thinking in cycle I = 57,58%, cycle II = 67,24%, and cycle III = 89,01%. The percentage of the students’ activities in cycle I = 39,20%, cycle II = 59,40%, and cycle III = 93,93%. It can be concluded that the application of Scientific Approach-based Cognitive Growth model in the learning process can improve the activities and critical thinking ability of VIII grade students in the subject mattertopics of cubes and beams at the SMP IT Ihsanul Fikri of Magelang city.

Pembelajaran Model Cognitive Growth Berbasis Scientific Approach untuk Meningkatkan Aktivitas dan Kemampuan Berpikir Kritis