IMPLEMENTASI MODEL PEMBELAJARAN INVESTIGASI KELOMPOK PADA PEMECAHAN MASALAH OPERASI HITUNG ALJABAR KELAS VII SMP NEGERI 3 BATU

Keywords: learning, group investigation, problem-solving.\ud The success of one of mathematics instruction is determined by the selection of appropriate learning motode. From the models of learning that has been developed, one model of learning that is assumed to support the creation of a dynamic learning situation, not saturated and can support creativity and interaction among students and teachers are learning model investigation group.\ud Writing aims to: (1) describe the application of investigative learning model of problem-solving group algebra arithmetic operations on class VII-F SMP Negeri 03 Batu, (2) describe the activities of teachers and students, and (3) know the results after application of student learning learning model of group investigation Writing is used qualitative descriptive research. As a source of data, selected students of class VII-F SMP Negeri 3 Batu 2010/2011 school year which amounted to 32 students. This research was conducted in September 2010 consisting of 2 meetings.\ud The result of writing done shows that the average teacher activity after two meetings of 93.33%.\ud Because the percentage of teachers' activity is in the interval between 85% - 100% then the teacher during the learning activities are "very good". Meanwhile, student activity from the first and second meetings to obtain the average percentage of student activity by 80% and activity\ud beyond the criteria of 20%. Because the percentage of student activity is in the interval between 70% - 84% of the activity students are "good". While student learning outcomes indicate that the 32 students who take the test, as many as 27 students who meet the KKM and 5 students who do not meet the KKM, so that students who complete at 84.37% and an incomplete by 15.63%. This means complete in classical. Investigating Learning Groups can be an alternative for teachers to be applied in mathematics in the classroom because it can motivate students to be more active and creative in learning mathematics