Fitri Raudhah : Penerapan Metode Pembelajaran Peer Teaching untuk Meningkatkan Motivasi Belajar, Hasil belajar dan Retensi Siswa pada Materi Sistem Pencernaan di MAS Darul Ulum Banda Aceh. Pembimbing I Dr. Hasanuddin, M.Si,. Pembimbing II Dr. Safrida, M.Si. ABSTRAK Penelitian ini bertujuan mengetahui penerapan model pembelajaran peer teaching untuk meningkatkan motivasi belajar, hasil belajar dan retensi siswa pada materi sistem pencernaan di MAS Darul Ulum Banda Aceh. Pengambilan data dilakukan pada bulan Januari 2017. Metode yang digunakan dalam penelitian ini adalah metode eksperimen dengan rancangan pretestpostest control group design. Penelitian ini dilaksanakan pada dua kelas yaitu XI MIA 1 sebagai kelas kontrol dan XI MIA 2 sebagai kelas eksperimen. Instrumen yang digunakan adalah angket motivasi untuk melihat motivasi belajar siswa,tes objektif yang terdiri dari 20 soal pilihan ganda untuk melihat hasil belajar, tes objektif yang terdiri dari 20 soal pilihan ganda postes yang sudah diacak untuk melihat retensi siswa. Analisis data menggunakan uji Mann Whitney dengan bantuan SPSS 17.0 for windows pada taraf signifikan 0,05. Hasil penelitian nilai motivasi belajar kelas eksperimen pertemuan pertama adalah 65,71% termasuk kategori baik dan kelas kontrol pertemuan pertama 46,7% termasuk kategori baik. Pertemuan kedua nilai motivasi belajar kelas eksperimen 98% termasuk kategori baik dan pada kelas kontrol 86,7% termasuk kategori baik. Persentase peningkatan hasil belajar kelas eksperimen adalah 60% termasuk kategori tinggi dan kelas kontrol 27% termasuk kategori rendah. Pada nilai retensi siswa kelas eksperimen adalah 91% termasuk kategori sangat tinggi dan kelas kontrol 63% termasuk kategori rendah. Dari ketiga variabel yang telah diukur hal tersebut menunjukkan bahwa penerapan metode peer teaching dapat meningkatkan motivasi belajar, hasil belajar dan retensi siswa pada materi sistem pencernaan di MAS Darul Ulum Banda Aceh Kata Kunci: Peer Teaching, Motivasi Belajar, Hasil Belajar, Retensi Siswa, Sistem Pencernaan Fitri Raudhah : The Implementation of Peer Teaching Method in Increasing Learning Motivation, Output, and Retention in the Concept of Digestive System at Islamic Senior High School (MAS) Darul Ulum Banda Aceh. Advisor I Dr. Hasanuddin, M.Si., Advisor II Dr. Safrida, M.Si. ABSTRACT The objective of this research was to identify the implementation of Peer Teaching Method in increasing learning motivation, output, and retention in the concept of Digestive System at Islamic Senior High School (MAS) Darul Ulum Banda Aceh. Data used in this research were collected in January 2017. Experimental method with pretest-posttest control group design was used in this research. There were two classes chosen as the samples of this research, namely class XI MIA 1 as the control group and XI MIA 2 as the experimental group. A questionnaire measuring students’ learning motivation, an objective test with 20 multiple-choice items measuring students’ learning output, and the objective test with 20 randomized items measuring students’ learning retention were used as the research instruments. The data that have been collected were analyzed by means of Mann-Whitney U Test supported by SPSS 17.0 for Windows with significance level of 0.05. The results showed that the average score of students’ motivation in the experimental group was 65,71% included good category while the control group obtained 46,7% included good category. The second result motivation in the experimental group was 98% included good category and control group obtained 86,7% included good category. In addition, N-gain scores of both classes were also measured, the experimental group got 60% included very high category, and the control group got 27% included low category. Moreover, the average score of students’ retention in the experimental group was 91% included very high category while the control group reached 63% included low category. By considering the three variables measured above, it could be concluded that the implementation of Peer Teaching Method increased the learning motivation, learning output, and learning retention of the students in the concept of Digestive System at Islamic Senior High School (MAS) Darul Ulum Banda Aceh. Keywords: Peer Teaching, Learning Motivation, Learning Output, Learning Retention, Digestive System.