Penelitian ini bertujuan untuk mendeskripsikan jenis kesalahan yang dilakukan oleh siswa pada materi teorema pythagoras. Penelitian ini merupakan penelitian deskriptif kualitatif. Teknik pengumpulan data menggunakan triangulasi teknik dan sumber, yaitu berupa hasil tes dalam bentuk uraian sebanyak 3 soal, wawancara tidak berstuktur dan dokumentasi berupa buku catatan siswa dan LKS siswa. Sampel terdiri dari 24 siswa dengan kemampuan yang berbeda yaitu, rendah, tinggi dan sedang. Hasil penelitian ini diperoleh bahwa persentase rata-rata kesalahan konseptual siswa sebesar 99% dalam kategori sangat tinggi, persentase rata-rata kesalahan prosedural siswa sebesar 63% dalam kategori tinggi, dan persentase rata-rata kesalahan komputasi siswa sebesar 82% dalam kategori sangat tinggi.

ABSTRAKPenelitian ini bertujuan untuk mengetahui ketuntasan hasil belajar matematika siswa kelas VIII SMP Negeri B. Srikaton tahun pelajaran 2017/2018 setelah diterapkan model pembelajaran kooperatif tipe Student Facilitator and Explaining (SFaE). Jenis penelitian ini adalah eksperimen, dengan desain yang digunakan adalah pre-test dan post-test group design. Populasi dalam penelitian ini adalah seluruh siswa kelas VIII SMP Negeri B. Srikaton yang berjumlah 258 siswa. Satu kelas diambil sampel secara acak, yaitu kelas VIII.6 berjumlah 37 siswa sebagai kelas eksperimen. Hasil penelitian yang diperoleh data skor akhir analisis dengan menggunakan uji-t. Rata-rata skor terhadap hasil belajar matematika sebesar 81,57. Berdasarkan hasil analisis data dengan taraf signifikan α = 0,05 didapat thitung = 6,41 dan ttabel = 1,69 karena thitung > ttabel, maka diperoleh kesimpulan bahwa

The purpose of this study was to develop a realistic worksheet using the Ethnomatematics on SPLDV material and to determine the quality of worksheets in terms of validity and practicality. The method used in this study is the Research and Dependency (R&D) method which is a developmental study referring to the 4-D development model, namely define, design, develop, and disseminate modified to 3-D. The instruments used to measure the quality of worksheets that were developed include validation sheets, and practicality questionnaires. The product of this research is a realistic worksheet using ethnomatematics context on SPLDV material with the advice of eighth grade students of junior high school. The results showed that: (1) the quality of worksheets seen from the validity aspects included in the valid category with an overall average score of 3.06; and (2) the quality of worksheets seen from the practical aspect is categorized very practical with an overall average score of 3.5. Conclusion, the development of PMRI-based worksheets in the context of ethnomatematics in SPLDV material was declared valid and practically used by students. Keywords: Ethnomatematics worksheet, PMRI, SPLDV

This study aims to develop PMRI-based interactive learning media using professional macromedia flash 8 on square and rectangular subject matter for grade VII students of SMP Negeri 8 lubuklinggau, as well as knowing the quality of mathematics learning media developed from aspects of validity and practicality. The research method used is the Research & Development method based on the ADDIE development model. The ADDIE development model consists of 5 stages: analysis (Analyze); planning (design); development (Development); implementation (Implementation) and (5) evaluation (Evaluation). The results of this study produce a valid and practical interactive learning media. The results of validation by material experts and media experts indicate that PMRI-based interactive learning media using professional macromedia flash 8 square and rectangular subject matter meet very valid criteria with an average score of 4.22. As for the practicality assessment that was tested by teachers and students found to meet very practical criteria with an average score of 4.45. In conclusion, the development of interactive learning media using PMRI based using Macromedia Flash Professional 8 on the subject matter of square and rectangular for VII grade students of SMP Negeri 8 lubuklinggau shows valid and practical criteria to use. Keywords: Interactive learning media, Macromedia Flash, PMRI, Square and Rectangle.