In SDN Sumberejo I found in rural areas, because it affects the mindset and behavior of students. In mathematics learning is dominated by the teachers and students are not active. Because teachers do not use the model of learning, so that learning becomes boring. The purpose of research that students can achieve mastery Minimal Criteria (KKM) with Jigsaw learning model, student learning outcomes can be improved through learning models Jigsaw, and students can be actively involved in the learning of mathematics through Jigsaw learning model. Methodology The research included the study subjects are fourth grade students of SDN Sumberejo I Demak Mranggen District Academic Year 2011/2012, a study in fourth grade Sumberejo SDN I district Mranggen Demak, there are two research variables are independent variables were the type of learning mathematics with Jigsaw Cooperative and dependent variable is the student learning outcomes, data collection techniques include observation, documentation, and testing formative student data analysis methods include the analysis of the test instrument to test the validity, reliability, and level of difficulty of the test, while the data analysis techniques by measuring the thoroughness of individuals and groups, student learning outcomes, and the activity of students in learning mathematics. From the analysis of learning outcomes achieved by students, the learning cycle I know the lowest value and highest value 10 100, with the average grade 56.67. Students who pass the value KKM 65 there are 11 students or 36.7% of students who do not complete and there are 19 students or 63.3%. Based on the observations that have been made in the first cycle of learning needs to be improved on the second cycle. From the analysis of learning outcomes achieved by students in the learning process of improvement in the second cycle is known lowest value and highest value 50 100 with average grade 70. Students who pass the value KKM 65 there are 19 students or 63.3% of students who do not complete and there are 11 students or 36.7%. Based on the observations that have been made on the second cycle there is need for improvement of learning at the third cycle. From the analysis of learning outcomes achieved by students know the lowest score is 60 and the highest score is 100 with a grade average was 78.33. Students who pass the value KKM 65 there are 27 students or 90% of students who do not complete and there are 3 students or 10%. Based on the observations that have been made on the third cycle is known that their students can achieve KKM, student learning outcomes can be improved, and students can be actively involved in the learning of mathematics through Jigsaw learning model.
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