The lack of students’ learning mathematic motivation at Grade VII PI MTs Pondok Pesantren Mardhatillah Tano Ponggol, during learning process because the method that uses by teacher is conventional method that make students’ learning motivation is law. So that, very important to make a change in implementation the learning in the class, one of them with giving reinforcement to make the students’ to be active in learning process.The formulation of the problem in this research is wether giving reinforcement can increase students’ learning motivation on triangle fundamental discussion at Grade VII PI MTs Pondok Pesantren Mardhatillah Tano Ponggol, Angkola Barat subdistrict. Whereas, the purpose of this research is to know whether giving reinforcement can increase students’ learning motivation on triangle fundamental discussion at Grade VII PI MTs Pondok Pesantren Mardhatillah Tano Ponggol Angkola Barat subdistrict.This research is Classroom Action Research (CAR) collaborates with course teacher. The location of this research in MTs Pondok Pesantren Mardhatillah Tano  Ponggol Angkola Barat subdistrict.Which the sample is class VII PI that consist of 28 students’. Instrument of collecting data that uses begin from planning, action,, monitoring and reflection. This research do in 2 cycles, each cycles are 2 meeting.The result of this research shows that Ha is accepted is there is significant effect or raising of students’ learning mathematic motivation through giving reinforcement on triangle fundamental discussion at grade VII PI MTs Pondok Pesantren Mardhatillah Tano Ponggol, Angkola Barat subdistrict. Each observation is meanscore of students’ learning mathematic motivation on the first cycle is 50,3% is increase on the second cycle with meanscore is 73,89%, raising that happen is 23,59%. Whereas, raising gets on questionnaire is refer to meanscore of students learning mathematic motivation on the first cycle is 68,93% is increase on the second cycle with meanscore is 76,07%, raising that happen is 7,14%.