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The purposes of this research were to 1) develop an effectiveness of the mathematics instructional model to enhance concept and retention of mathematics concept, 2) study the effectiveness of mathematics instructional model, and 3) study the opinion of the students toward the instruction with the developed mathematics instructional model. The samples in this research were 40 students of Nongnguluem Pitthayakhom School in the 2nd semester of academic year 2018, which were selected by cluster random sampling. The research instruments were an instruction model, a manual for using an instructional model, lesson plans, achievement test, and questionnaire. Data were analyzed with statistics methods to find percentage, mean, standard deviation and t-test.
The results of this study revealed that the mathematics instructional model to enhance concept and retention of mathematics concept called “REUCA Model” was consisted of five stages: 1) Reviewing; 2) Example; 3) Understanding; 4) Constructing Formation and 5) Applying. The efficiency of the mathematics instructional model met the criterion 80.65/81.17 according to the criterion of 80/80. The mathematics concept achievement of Mathayomsuksa 1 students after using a mathematics instructional model was higher than before with the significant at .01. Moreover, students after using a mathematics instructional model had retention of mathematics concept. The opinion of the students toward the instruction with the developed mathematics instructional model was the high agreement level.
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