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Permasalahan penelitian menujukkan kepada guru yang masih menggunakan model pembelajaran yang monoton, metode yang digunakan kurang bervarian seperti hanya ceramah satu arah, penugasan yang tidak bervariatif, tanya jawab. Jenis penelitian yaitu penelitian tindakan kelas (PTK) dengan dua siklus dan untuk tiap siklusnya terdiri dari empat tahapan diantaranya perencanaan, tindakan, pengamatan, dan refleksi melalui Model Cooperative Learning tipe NHT pada mata pelajaran SKI. Subjek penelitian ini adalah siswa kelas X dengan jumlah siswa 36 siswa dengan perincian 17 siswa laki-laki dan 19 siswa perempuan. Hasil penelitian bahwa pada pelaksanaan siklus I terdapat  hasil peningkatan pemahaman belajar siswa diperoleh dari 36 siswa yaitu siswa yang telah mencapai ketuntasan belajar sebanyak 21 siswa dan siswa yang tidak mencapai tuntas belajar sebanyak 15 siswa dengan persentase 58,33% dan dapat termasuk dalam kriteria baik. Pada siklus II, siswa sudah menunjukkan peningkatan hasil pemahaman yang sangat baik, dengan pencapaian ketuntasan belajar sebanyak 31 siswa dan yang tidak mencapai ketuntasan belajar 5 siswa dengan persentase ketuntasan belajar sebesar 86,66% dan termasuk dalam kriteria sangat baik. Pada siklus I dan siklus II pemahaman siswa dengan menggunakan Model Cooperative Learning tipe NHT telah meningkat dan peningkatannya sebesar 28,33%. Berdasarkan dari hasil tersebut, maka dapat disimpulkan dengan Penerapan Model Pembelajaran Cooperative Learning Type Numberred Head Together (NHT)  pada mata pelajaran Sejarah Kebudayaan Islam dapat meningkatkan pemahaman belajar siswa kelas X  MAN 1 Langkat    

This study aims to determine the effect of the combination of the STAD learning model with NHT on the problem solving ability of students in class X Mipa 3 and 4 at SMA Negeri 9 Malang with the material being taught is kingdom Monera this research is a qusi-experimental research using a purposive sampling design. The population in this study amounted to 68 students who werea a combination of all class X in the school, while the sample was taken from two classes with 34 participants in the each class. The class was divided into control and experimental classes, where each class used conventional model for the control class and combination of STAD and NHT learning model for the experimental class. The study measures the problem solving ability of students. The data collection teachniques in the study were in the from of problem solving ability tests, observations, interview, documention with instruments in the from of lesson plans, LKPD, LKPD assement rubrics, observation sheets on the implementation of learning implematation plans, and problem solving ability instrument sheets in the from pre-test and post-test essays. Test analysis of research data used inferential statistical analysis with covariate analysis (anacova). The result of the hypothesis test showed that there was a significant effect, namely 0.008 < 0,05 from the learning model combination the STAD and NHT models with the kingdom monera material in class X at SMA Negeri 9 Malang.

The purpose of this study was to determine the effect of the NHT type cooperative learning model on learning outcomes of basic volleyball passing techniques. This type of research is a quasi- experimental (quasi-experimental) research design using the non-randomized control group pretest- posttest design. The research subjects were 53 students of class XI AKL 1 SMK Darussalam Karangpucung Kabupaten Cilacap Regency for the 2019/2020 academic year. Learning outcome data were collected through the pretest and posttest. Data analysis used t-test with SPSS 16.0 for Windows. Experiments were carried out 3 times beyond pretest-posttest treatment. Learning outcome data were collected through objective tests, observation and performance. In the experimental group the pretest score was 66.48, while the control group was 64.0. The results of the posttest score in the experimental group obtained an average value of 82.76. While the control group obtained an average value of 78.18. The average normalized gain score obtained in each group is in the experimental group of 0.5 while the control group is 0.4. The significance number obtained is sig 0.001 <0.05. From the research results, it can be concluded that the learning outcomes of students who were given treatment using the NHT type of cooperative learning model were more improved compared to the control group given the conventional learning model. The NHT type cooperative learning model has a significant effect on the improvement of learning outcomes of the basic techniques of volleyball passing in class XI AKL 1 SMK Darussalam Karangpucung Kabupaten Cilacap.