Reforming Mathematic Through The Concept Of Cooperative Learning By Using The Technique Think-Pair-Share Focusing On Cube And Cuboid To Improve The Study Result And Activity Of Students From Banyubiru 1 State Middle School Class Of Viiie In Semarang District On Their Second Semester Year Of 2010/2011

Determining the use of mathematical model is very influential on students’ study outcomes and activity. In deciding the mathematical model, teacher should consider students’ characteristic, the material, and also the students’ habits. So far, mathematics teacher of class VIII E SMP Negeri I Banyubiru Kabupaten Semarang tend to use the method of lecture and mechanistic structural because he feel that this is the easiest method for the students to digest. Furthermore, the teacher only uses props on materials that are considered hard. This style of teaching from the teacher has an impact on students. Students tend to be passive when lecture is in process resulting in less student activity and also minimum result on their study. This is proven by their average mark which is 60.51 and the limit to pass is 38.7%. Because of this, reforming mathematic through the concept of cooperative learning by using the technique think-pair-share is needed. This research of type“Penelitian Tindakan Kelas” (PTK) with 3 trialwhereas in trial 1, the average increases to 89,9 and the limit to pass is 96,77% and the student activity is 28,35%; for the second trial, the results are the average of 92,55 with the limit to pass 100% and the student activity is 41,38%; and for the last trial the results are the average of 96,29 with the limit to pass 100% and the student activity is 52,12%. Key Words: classroom action research, Cooperative Learning Tipe Think-Pair-Share, space cube and cuboid