Abstrak. Penelitian ini bertujuan untuk mengetahui model pembelajaran Missouri Mathematics Project (MMP) menggunakan strategi Think-Talk-Write (TTW) dapat meningkatkan kemampuan berpikir kritis, kemampuan pemecahan masalah matematis siswa, perbedaan skor ratarata kemampuan berpikir kritis dengan kemampuan pemecahan masalah matematika siswa menggunakan model pembelajaran MMP dikombinasi dengan strategi TTW. Populasi penelitian ini adalah seluruh siswa kelas VIII SMP Xaverius Lubuklinggau. Metode penelitian yang digunakan adalah metode eksperimen dengan jenis eksperimen yang digunakan adalah True Experimental Design. Berdasarkan hasil analisis data, diketahui peningkatan skor rata-rata kemampuan berpikir kritis siswa sebesar 31,07 dan berada pada kategori sangat baik dengan persentase 89,53%. Sedangkan peningkatan skor rata-rata kemampuan pemecahan masalah matematika siswa sebesar 15,19 sudah berada di kategori baik dengan persentase sebesar 69,90%. Setelah dilakukan uji normalitas dan uji homogenitas data diperoleh kesimpulan pada uji-t ' yaitu H0 ditolak dan Ha diterima, sehingga dapat disimpulkan bahwa, terdapat perbedaan skor kemampuan berpikir kritis dengan skor kemampuan pemecahan masalah menggunakan Model Missouri Mathematics Project dikombinasi dengan Strategi Think Talk Write.

This study aims to develop the worksheet based Learning Model Missouri Mathematics Project using Think Talk Write Strategy on cube and cuboid material, and to find out the quality of the worksheet developed in terms of validity and practicality. Subjects in this study are students of class VIII SMP N 11 Lubuklinggau in the even semester of the 2018/2019 school year. This research is a development research that refers to the 4-D development model (Define, Design, Develop, and Disseminate). Based on the analysis results, it was found that the quality of worksheets developed was based on the assessment of 3 validators, the validity aspect was in the Good category with an average score of 3.99, while the quality of worksheets from the practical aspect was in the Very Practical category with an average score of 0.903.

The purpose of this research is to develop teaching materials use Approach of Indonesian Realistic Mathematics (PMRI) on Cube and cuboid material for grade VIII students of SMP Negeri 13 Lubuklinggau and to know the quality of teaching material is seen from the aspect of validity and practicability. RME or in Indonesia is better known by PMRI is a learning approach mathematics oriented to everyday life close to the world of students, it aims to make it easier for students to understand problems and solve mathematical problems. This research is development research with the development model of ADDIE ( Analysis, Design, Development, Implementation, Evaluation). phase analysis includes student needs analysis and curriculum analysis, the design phase includes the preparation of the map needs of teaching materials, the establishment of teaching materials structure and the making of research instruments. Development phase includes the preparation of teaching materials and validation of teaching materials on the expert, the implementation phase includes teaching experiments on 3 students (one to one), small group (small group) and field test. The evaluation phase includes the assessment of teaching materials by teachers and students. The research used Approach of Indonesian Realistic Mathematics (PMRI) on cube and cuboid material, the result of research showed that (1) the quality of teaching material is seen from aspect of validity and practicality included in criterion either based on four expert lecturer (Expert Content / Mathematics, Media Expert and Expert Language).Keywords: PMRI, Cube, Cuboid, ADDIE

Penelitian ini bertujuan untuk mengembangkan lembar kerja peserta didik (LKPD) berbasis pendekatan saintifik pada materi sistem persamaan linear dua variabel (SPLDV) di kelas VIII sesuai dengan kurikulum 2013. Penelitian ini merupakan penelitian pengembangan dengan menggunakan model 4-D yang terdiri dari 4 tahap yaitu: tahap Define, Design, Develop, dan Disseminate. Teknik pengumpulan data yang digunakan adalah angket validitas dan angket kepraktisan. Berdasarkan hasil analisis penilaian oleh keempat ahli yaitu: ahli bahasa, ahli materi, ahli media dan ahli isi menunjukkan bahwa lembar kerja peserta didik menggunakan pendekatan saintifik pada materi sistem persamaan linear dua variabel (SPLDV) memenuhi kriteria valid dengan rata-rata skor 3,37. Sedangkan hasil analisis penilaian lembar kepraktisan siswa yang terdiri dari 31 orang diperoleh bahwa lembar kerja peserta didik menggunakan pendekatan saintifik pada materi sistem persamaan linear dua variabel (SPLDV) memenuhi kriteria praktis dengan rata-rata skor 3,31.

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