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The aim of this study is to develop a product of teaching material based on batak toba culture that meet valid, effective and pratical citeria. The teaching material developed that is: teacher book, student book, and workksheet of student for improve the ability of mathematical problem solving on the topic of Systems of Linear Equation in Three Variables and subjects of this study were students in the tenth grade of SMA Markus Medan, North Sumatera. The type of research used is development research using the development of dick and carey models. Where the stages of this study consist of 10 stages. The results of this study indicate that teaching materials based on batak toba culture developed meet valid criteria. Teaching materials developed also meet practical criteria based on expert opinion, responses of students and teachers who state teaching materials can be used easily. Teaching materials based on batak toba culture developed meet the effective criteria with the completeness of student learning outcomes classically in the trial-I, which is 30 students (85.00%) completed from 30 students, while in the trial-II, 30 people students (85.00%) completed from 30 students; (2) student activities in all aspects observed at the ideal time tolerance set, and the average value of the ability of teachers to manage learning in trial-I is 3.12 and in trial-II is 3.22 with good category; and (3) the positive response of students in trial-I was 91.15% and in trial-II reached 95.00% students responded positively to the components of teaching materials and learning activities. The mathematical problem solving abilities of students taught using teaching materials developed based on batak toba culture experienced an increase, namely in the first trial of 80.38% of students who completed, while in the second trial 76.22% of students completed with an increase of 4, 12%.