The aim of this research to know the error of problem solving in trigonometry. This research used the qualitative descriptive, with the subject of research is 80 students who were taken be based on purposive sampling. The procedure of the data was used by the think out louds. Technically the analysis of the data that was used was (1) studied all the data’s that were gathered, (2) studied results of the work of the student in resolving the problem of trigonometry, (3) carried out the verification from the data. The checking of the legality of the data used the triangulation. The first and second stage of error was the concept, the third stage of error was the algorithm, and the fourth stage of error was habits and Confirmation of the answer. Keyword: error,  problem solving,  trigonometry

Penelitian ini bertujuan untuk mengetahui persentase kesalahan terbesar yang dilakukan siswa dalam menyelesaikan masalah matematika pada materi himpunan. Jenis penelitian ini adalah deskriptif kualitatif. Subyek penelitian ini adalah siswa kelas VIIA SMP Taman Dewasa Ibu Pawiyatan yang berjumlah 26 orang.Teknik pengumpulan data menggunakan teknik tes dan wawancara. Keabsahan data dilakukan dengan triangulasi metode dengan membandingkan data  hasil tes dan wawancara. Teknik analisis data dilakukan dengan tahapan  1) menelaah semua data yang terkumpul, 2) menelaah hasil pekerjaan siswa, 3) melakukan penarikan kesimpulan dari data. Kerangka analisis dikembangkan berdasarkan kategori kesalahan Polya. Hasil Penelitian ini diperoleh empat jenis kesalahan dan besar persentase untuk setiap jenis kesalahan yaitu kesalahan memahami masalah 49,36%, kesalahan menyusun atau membuat rencana 26,92%, kesalahan melaksanakan rencana 34,16%, dan kesalahan memeriksa kembali jawaban 41,5%. Hasil menunjukan kesalahan memahami masalah dan lebih dominan dibandingkan dengan kesalahan lainnya. Kesalahan tahap pertama dan kedua merupakan kesalahan konsep dan prinsip, kesalahan ketiga merupakan kesalahan prosedur dan algoritma dan kesalahan tahap empat merupakan kesalahan penegasan jawaban. Kata Kunci : Analisis Kesalahan, Penyelesaian Masalah, Masalah Matematika.

The purpose of this study was to develop a number theory textbook in order to improve prospective teachers' understanding of concepts and describe the feasibility of teaching materials number theory. The type of research used is the research development, with the development model chosen is a development model that fits the procedure suggested by Borg and Gall which consists of 5 steps. The steps taken are product analysis to be developed, initial product development, expert validation, and product revision, limited field trials, and product revisions, main field trials, and final products. Data creation techniques using product validation techniques and product trials. This study focuses on the steps of analyzing products that are developed up to expert validation steps. The validator suggests that textbooks are very good in all three aspects with an average score of 4.62 on a scale of 5 and can be continued at the Small-scale Trial stage.

Penelitian ini dilakukan untuk mengeksplorasi unsur-unsur matematika (etnomatematika) pada Candi Asu. Metode yang digunakan dalam penelitian ini adalah metode kualitatif dengan pendekatan etnografi. Data-data yang dipakai adalah data yang diperoleh melalui studi literatur, observasi, wawancara dan dokumentasi. Studi literatur dan wawancara digunakan untuk mengetahui aspek budaya yang terdapat di Candi Asu. Observasi digunakan untuk mengetahui aspek matematis pada Candi Asu. Dokumentasi sendiri digunakan untuk mendukung data-data yang telah diperoleh baik data wawancara maupun observasi. Hasil dari penelitian ini adalah terdapat unsur-unsur matematika (etnomatematika) pada Candi Asu, yaitu konsep persegi panjang, trapesium, pencerminan, dan geometri ruang.

This study aims to find out the effectiveness of TAI model through mathematics learning outcomes in terms of students' student activity. This research was a quasi-experimental research. Sampling technique in this research used Cluster Random Sampling technique. Data collection technique used questionnaire and tests. The data analysis technique used two-way variance analysis with unequal cell. The result of this research was that learning using TAI model is not more effective to use (Fobs< Ftable) with 2.859 <4.00; Students who have high student activity, have mathematics learning outcomes that are no better than those with moderate and low-skilled students (Fobs< Ftable) with 0.5576 < 3.15; There is no interaction between the learning model used and the student activity to the students' mathematics learning outcomes (Fobs< Ftable= 0.44 <3.15). A suggestion on the results of this study is in the process of teaching and learning teachers should be able to create an atmosphere of learning that can make students become more active.