摘要：Nowadays, learning should be directed to develop the 21st -century core competencies, including creative thinking in problem-solving. Therefore, the present study aimed to improve the students' creative thinking and mathematics learning outcome through the implementation of the Treffinger learning model with Realistic Mathematics Education (RME) principles. To achieve the goals, experiment study with Quasi-Experimental Post-test Only Control Group design had deliberately chosen as the method of the study. The subjects of the present study were 101 fifth graders students in Lelak, Manggarai-Indonesia. The subject was chosen by a random sampling technique. The data related to creative thinking skill and mathematics learning outcomes were collected by using essay tests with five items each. The instruments have been judges as valid by the assessment of five experts and empirically reliable. The hypothesis testing was done by using MANOVA at a 5% level of the significance level. Hypotheses were tested using MANOVA with the aid of SPSS. The result of the statistical analysis shows that F Wilks' Lambda = 17, 195, and sig. < 0.001. Since the sig value was less than 0.05, then it can be argued that simultaneously creative thinking skill and mathematics learning outcome of the students who took mathematics through the Treffinger learning model using RME principles were better than those of their counterparts who learned the same subject through the conventional learning model.
