Pengaruh Penggunaan Lembar Kegiatan Peserta Didik Berbasis Model APOS Berbantuan Geogebra Terhadap Keterampilan Berpikir Kritis Matematika

The purpose of this research is to determine the effect of using student activity sheets based on the Geogebra-assisted APOS model on mathematical critical thinking skills in quadrilateral material in class VII SMP Negeri 1 Bengkulu Selatan. The research design used is a quasi-experimental design with a population of all seventh-grade students at SMP Negeri 1 Bengkulu Selatan. The sample technique research used is a random sampling technique, to obtain a sample group in the activity of 2 classes, namely the experimental class and the control class. This study uses an instrument in the form of a pretest and a posttest in the form of an essay that has been tested. After doing the research, the average obtained from the post-test results for the experimental class was 82.17 and the average post-test results for the control class was 70.74. These results were obtained from the results of hypothesis testing with the ANCOVA test using SPSS21 software with = 0.05. From this test, sig(0.000) < 0.05 was obtained so that there was a significant effect of using the APOS model-based student activity sheet which was assisted by Geogebra on the ability to think critically in mathematics.