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This study aims to determine whether or not there is a difference in students mathematical abilities of creative thinking between structured learning approach problem posing and conventional. The hypothesis of this study is: "There are differences in mathematical ability of students creative thinking between structured learning approach problem posing and conventional". The research was conducted in SMP Negeri 1 Setu in grade 7 in the second semester of academic year 2017/2018. The samples studied as many as 64 students consisting of 32 student experiment class I and II experimental class of 32 students. The method used in this study is a quasi-experimental design. The research instrument is essay by 8 items. Test requirements analysis used in this study is Lilliefors test for normality and F-test for homogeneity. Based on calculations for the experimental class I obtained Lhitung = 0.1076 <0.1566 = Ltabel and experimental class II obtained Lhitung = 0.1190 <0.1617 = Ltabel, it can be concluded that both classes of normal distribution. F-test for homogeneity with significance level of 0.05 was obtained Fhitung = 1.2687 <1.8481 Ftabel, it can be concluded both homogeneous class after being treated. Average - Average score of experiment class I obtained was 26.3 and the average - average scores obtained experimental class II 20.5. Hypothesis testing using t-test with a significance level of 0.05 obtained t = 11.6812> 1.67 = t-tabel then H0 is rejected.