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This research aimed to study the effects of using mathematising process on the topic of application of linear equation for one variable to enhance creative problem solving competency of 7th grade students. The number of participants were 44 students of Saluang Pittayakom School, Phichit Province. The instruments used in the research were three lesson plans based on mathematising process on the topic of application of linear equation for one variable, activity sheets, and creative problem solving ability test. Data were analyzed by content analysis and data creditability by triangulation method. The results revealed that most of students were in good level of creative problem solving ability. Namely, students could show fact finding skills in very good level (68.18%), could show problem finding skills in good level (54.55%), could show problem Idea skills in good (50.00%), could show solution finding skills in good (43.18%), and can show creating new knowledge skills in good level (59.09%).
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