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The purposes of this research was both to study the learning achievement of matthayomsuksa 2 students in solving ratio and percentage word problems by normal teaching together with Bar Model method and to evaluate learner satisfaction. The sample for the study was a class of 37 students who were using cluster sampling from 13 classes at one school in Chonburi province. The tools for data collection were seven periods on the experiment, two sub-tests, two learning achievement tests, and an evaluative questionnaire on learner satisfaction. The study was conducted over seven class periods.
The findings revealed that more than 60% of all students more than the rest of the group at the .05 level. Learner satisfaction was at a high level ( =3.82, S.D.=0.85 ).
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