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This research aims to: 1) analyze the effect of self regulated learning (KB), mathematical disposition (DP) and habit of mind (HoM) on mathematical problem-solving ability (KMP); 2) Contribution value has given by KB, DP, HoM on KMP; and 3) identify the dominant factors to affect KMP. This research was conducted of grade 8 in one of private junior high school in North Sumatra, academic year of 2018/2019 with 32 participating students which were taken with cluster random sampling technique. The research instruments used in this included mathematical problem-solving ability test and questionnaires. Data was analyzed by Path Analysis. The Result showed 1) KB, DP, and HoM give a positive and significant effect on KMP; 2) Contribution value has given by KB, DP, HoM respectively are 24.26%, 5.8% and 13.32%; and 3) Factor which dominant to affect the mathematical problem-solving ability is self regulated (KB).