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The purposes of this research was to study the effects of learning activities on ratio, proportion and percentage based on STEM education on grade 7 students’ computational thinking ability. The participants were 28 grade 7 students at a small secondary school in Phitsanulok. The research was composed of 3 research instruments which are three lesson plans, worksheets, and computational thinking test. The data were analyzed by using analytic rubric. The results revealed that most students’ computational thinking is in excellent level. For each component of computational thinking, students’ ability in decomposition, pattern recognition and abstraction are mostly in excellent level. While students’ ability in algorithm is mainly in good level.
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