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The purpose of this study was to study the effect of using think-talk-write technique with phases-methods combinations model to develop students’ mathematical reasoning on circle. The sample of this study was 37 Mathayomsuksa III students who were selected by using cluster sampling, one classroom out of seven classrooms. The research instruments consisted of 10 lesson plans designed by using think-talk-write technique with phases-methods combinations model and the mathematical reasoning ability test. The data were analyzed by using descriptive statistics, which were frequency, percentage, mean, and standard deviation, and comparative statistics that is one-sample t-test. The results of the study revealed that most of students had mathematical reasoning ability at good and excellent levels. The hypothesis testing found that average score of students’ mathematical reasoning was higher than 18 (60 %) at the statistical significance of .05.
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