DEVELOPMENT OF CRITICAL THINKING SKILL AND MATHEMATICAL ACHIEVEMENT ON QUADRATIC FUNCTION OF GRADE 9 STUDENTS USING OPEN APPROACH AND GEOGEBRA
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Abstract
The purposes of this research were to 1) compare the critical thinking skills of grade 9 students and 2) compare the mathematical achievement of grade 9 students on quadratic function Between pretest and posttest of learning implementation based on open approach and GeoGebra. The sample group was 25 grade 9 students at Somdetprachanukor school in Kalasin province. The research instruments were as follows lesson plan using open approach and GeoGebra, a critical thinking skills test, and a mathematical achievement test. The statistics for data analysis were percentage, mean, standard deviation, and dependent sample t-test. The research findings were as follows: 1) Critical thinking skills on the quadratic function of grade 9 students after learning through open approach and GeoGebra learning were higher significantly than before at the .05 level considering each aspect, it was found that problem identification was the highest level (mean = 3.57, S.D. = 0.50) followed by problem definition (mean = 3.27, S.D. = 0.74), problem evaluation (mean = 3.20, S.D. = 0.76), problem exploration (mean = 3.17, S.D. = 0.79), problem integration (mean = 3.00, S.D. = 0.74) and 2) Mathematical achievement on the quadratic function of grade 9 students after learning through open approach and GeoGebra learning were higher significantly than before at the .05 level.
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