![]() Sampling was taken by cluster random sampling technique. The population in this research is the eighth class of the second half of SMP N 1 Adiluwih in the academic year 2017-2018. The aim of this research is to know the difference of the average of mathematics learning outcomes between the students Whose learning using cooperative learning model of type Head Head Together (NHT) Whose learning with the students using Think Pair Share (TPS) on the subject matter of the Circle. Meanwhile, according to Isjoni (2010) "cooperative learning model can improve student learning towards Cooperative learning is a learning model by using the grouping system or a small team of between four to six people who have a background in academic ability, gender, race or ethnicity different (heterogeneous) (Vienna Sanjaya, 2010: 220). In the implementation of cooperative learning, the model requires the participation and cooperation in the learning group (Trisnawati, 2018). This is supported by the results of research conducted by Zakaria and Ihsan (2007) concluded that cooperative learning model provides a better learning outcome than for traditional learning model (conventional). which supposedly can improve the learning process and improve learning outcomes. One of the many learning models provides an opportunity to cooperate with fellow students in tasks are structured cooperative learning. In addition, the activity in the classroom, teachers often do not provide the opportunity for students to study in groups, whereas in group learning activities can broaden the perspective and to build interpersonal skills to connect with other students. Students just passively listening to a description of the material presented by the teacher. This happens because of the tendency of teachers to deliver such materials in conventional, so it becomes less active students. the details can be seen that approximately 31.78% eighth-grade students who have reached KKM, approximately 68.22% while eighth-grade students have not said to have reached KKM. The average result of learning mathematics class VIII student on the subject of the circle in the second semester of the school year 2016-2017, ie 52. It is shown from the low average value of learning mathematics is still a lot to get a value below a minimum completeness criteria (KKM) of 62. Observations show that mathematics is still regarded as a difficult subject and many students fear that the learning of mathematics. This is reinforced by the results of pre-study that has been done in SMPN 1 Adiluwih. This causes the students complained of unsatisfactory performance in mathematics, but may excel in other fields". This is in line with the opinions Cockcroft (Wahyudin, 2009: 20) that "mathematics is a difficult subject to be taught and learned. The presumption is raised, one of them is because mathematics is seen as a difficult subject to grasp. Based on informal interviews with some students of class VIII Public Junior High School (SMPN) 1 Adiluwih that in general, they think "math is hard". This is consistent with the statement: "we must realize that mathematics is important, both as a science (scientists), as supervisor patterns of thinking, as well as forming an attitude" (Rachmawati, 2005: 2). Whether it's the math that is taught in schools of education or mathematics as an applied science that can be used in everyday life. ![]() The development of increasingly advanced education awakens people to the nature and usefulness of mathematics well as science. Judging from the overwhelming role of the lead math mathematics is a science that is very important to learn and understand (Amalia, 2018). Consciously or unconsciously, almost every time we find mathematics in everyday life, both in concept form, as well as its application. Mathematics is a science that has a big role in survival.
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