The Education and Culture Curriculum continues to update the curriculum in the hope that the learning process in education will improve. The curriculum is called the 2013 curriculum. Where in the 2013 curriculum students are required to think critically which is embodied in concrete actions by building collaboration between educational actors (teachers, students, managers). In the 2013 curriculum it is required to use various learning strategies so that student learning outcomes increase. This study aims to determine: (1) Contribution of learning interest to learning outcomes of mathematics, (2) Contribution of early ability to learning outcomes of mathematics, (3) Contribution of interest in learning and initial ability to learning outcomes of mathematics. This type of research is research with a quantitative approach Ex Post Facto design. With a sample of class XI IPS SMA NEGERI 1 Masbagik, a total of 168 students. Data collection uses a questionnaire method and test questions. The instrument used in collecting research data was in the form of a questionnaire containing 25 statement items for learning interest and early ability variables using midterm exam scores, while for learning outcome variables using test questions containing 4 questions. The data analysis technique used is a simple regression analysis technique and multiple regression analysis techniques. The results showed that there was an influence between learning interest on learning outcomes of 0.380 and based on the significant test, tcount > ttable (2.426 > 1.677). There is a significant influence between initial ability on learning outcomes of 0.440 with a significant test tcount > ttable (1.974 > 1.677). Furthermore, there is a positive influence between learning interest and initial ability on multiple learning outcomes of 0.872 and based on the significant test, Fcount > Ftable (23.978>1.68).