Algebra is one of the mathematical sciences studied in junior high school. Some students may have difficulty learning algebra. This study aims to determine the difficulties experienced by students in solving the problem of algebraic operations. The type of this research is qualitative research with case study approach. Subjects in this study are students of grade 8D 1 Salam Magelang junior high scchool, Central Java in the semester of the year 2016/2017 academic year. Methods of data collection used include algebraic operations tests, open questionnaires, and documentation. Data analysis techniques through data reduction, data presentation, and conclusions. The result of the research that there are students’ difficulties in doing algebraic problems related to concept and principle. Students difficulties experienced related to the concept of difficulty in determining variables and constants including but not understanding the definitions of variables and constants, and difficulties in applying the concept of division in algebra. The difficulty experienced in terms of principle is the application of the principle of addition to the algebraic form, the reduction in algebraic form, multiplication on the algebraic form, simplifying algebraic fractions, factoring, and solving algebra-related stories.

Penelitian ini bertujuan untuk mengetahui hubungan antara minat belajar dengan resiliensi matematis siswa dalam menerapkan flipped classroom pada masa pandemi covid-19. Jenis penelitian yang digunakan adalah penelitian  kuantitatif dengan pendekatan korelasional. Populasi penelitian merupakan seluruh siswa kelas XI TKJ di SMK Informatika Santu Petrus Ruteng tahun ajaran 2020/2021 berjumlah 124 siswa, sedangakan sampel diambil menggunakan teknik simple random sampling dengan jumlah sampel sebanyak 55 siswa. Teknik pengumpulan data dilakukan dengan metode angket. Data dianalisis menggunakan analisis regresi linear sederhana dengan  untuk menghitung signifikansi regresi. Berdasarkan hasil analisis regresi diperoleh persamaan Ŷ = 46.04 + 0.56X t_hitung = 11.62 dan t_tabel = 2.00 maka H_o: ρ = 0 ditolak dan H_1: ρ> 0 diterima. Ini berarti, koefesien regresi (b = slope = 0.56) sangat signifikan. Sementara itu besarnya kontribusi variabel X terhadap Y yaitu r ^ 2 x 100% = (0.8474512 x 100% = 75.75%, Berdasarkan data tersebut, disimpulkan bahwa semakin tinggi minat belajar siswa, maka semakin tinggi pula resiliensi matematis siswa. Sebaliknya, semakin rendah minat belajar siswa, maka semakin rendah pula resiliensi matematis siswa

Kalkulus integral merupakan salah satu mata kuliah matematika yang memerlukan tingkat penalaran, kemampuan komunikasi serta kemampuan berpikir tingkat tinggi yang memadai untuk dapat memahami dan menyelesaikan soal. Oleh karena itu, banyak mahasiswa mengalami kesulitan saat mempelajarinya sehingga melakukan banyak kesalahan saat memecahkan masalah. Tujuan penelitian ini adalah untuk mengidentifikasi kesalahan mahasiswa berdasarkan Newman’s Error Analysis (NEA) dalam menyelesaikan soal kalkulus integral disertai dengan pemberian scaffolding. Subjek penelitian adalah mahasiswa Program Studi Pendidikan Matematika Unika Santu Paulus yang mengikuti perkuliahan kalkulus integral. Teknik pengumpulan data menggunakan tes dan wawancara tidak terstruktur. Analisis data dilakukan dengan cara mereduksi data, menyajikan data dan menarik kesimpulan. Hasil penelitian menunjukkan bahwa tidak ada kesalahan yang dilakukan mahasiswa pada tipe indikator 1 (reading error), mahasiswa rata-rata melakukan kesalahan pada indikator 2 (comprehension error) sebesar 39%, rata-rata kesalahan pada indikator 3 (transformation error) sebesar 71%, rata-rata kesalahan pada indikator 4 (process skills error) sebesar 76% dan rata-rata kesalahan yang paling banyak dilakukan pada indikator 5 (encoding error) sebesar 87%.  Scaffolding yang digunakan untuk mengatasi semua kesalahan mahasiswa hanya sampai pada scaffolding level 2 yaitu explaining, reviewing, dan restructuring. Pemberian scaffolding yang dilakukan dosen bersifat menjelaskan, meninjau dan merestrukturisasi sehingga mendorong mahasiswa untuk memperbaiki kesalahan-kesalahan tersebut. Bertolak dari hasil penelitian ini, maka dosen diharapkan untuk melakukan kegiatan perkuliahan yang bermakna bagi mahasiswa sehingga tidak mudah untuk melupakan konsep-konsep materi yang telah dijelaskan.

STRENGTHENING TEACHER PEDAGOGICAL COMPETENCIES THROUGH THE USE OF DYNAMIC GEOMETRY SOFTWARE IN MATHEMATICS LEARNING. The selection of strategies, methods, models, and media of appropriate mathematics learning is a form of implementation of a teacher's pedagogical competence. In the 2013 curriculum, the teacher not only sets a scientific approach as a reference in implementing the learning process but also demands innovation to accommodate the right media as well. The role of instructional media, especially dynamic media, is very important in learning mathematics in both elementary and junior high schools. The media was used to explain abstract mathematical problems to be concrete, motivate students, stimulate student learning activities, and help the effectiveness of the learning process. Technological devices such as computers are one of the tools that can be used as dynamic mathematics learning media. Mathematical learning collaboration with ICT devices has been widely carried out in urban and rural areas in Indonesia. Dynamic Geometry Software (DGS) in the form of GeoGebra is a learning medium specifically developed to facilitate the learning of geometry, algebra, and calculus. Therefore, this community service activity (PkM) is intended to strengthen the teacher's pedagogical competence through the use of dynamic learning media using Dynamic Geometry Software (DGS) in the form of GeoGebra in mathematics learning in junior high schools. This PkM aims to train teachers to be able to operate or create mathematics learning media assisted by DGS, especially in learning geometry to students. By making their own, teachers can add insight and increase creativity in making learning media. The supported subjects in these community service activities were junior high school mathematics teachers in Ruteng City. As for the results obtained after the PKM activities, the teachers can operate and create mathematics learning media using DGS in the form of GeoGebra.

This study aimed to determine that the failure of students to evaluate mathematical explanations based on mathematics is influenced by sociomathematical norms, teaching authority, and classroom mathematics practice. The research method used is the case study method. The research data were obtained from inside and outside the research class. The data in the research class were in the form of field notes, video recordings of the class, video recordings of student group work, and student work. Data outside the research class is the result of interviews with three interview subjects. By studying the three evaluation methods students used in evaluating explanations, it was found that each student applied a different evaluation method at different times. The three evaluation methods contributed to some of the difficulties students experience in evaluating their mathematical descriptions. The results indicate that the failure of students in evaluating explanations is not solely due to errors in choosing the method, approach, or learning model used but can be caused by sociomathematical norms, authority, and classroom mathematics practices applied in the classroom.