This study aims to explain and describe the epistemological obstacle of students' mathematical conceptual understanding based on the SOLO taxonomy at MTs Negeri 2 Pontianak. This research uses a descriptive qualitative method with a survey form. The subjects of this research is 35 students in class VIII F MTs Negeri 2 Pontianak. Data collection techniques that used were test and and non-test. Data collection tools that used were conceptual understanding tests and interview. The results of data analysis from this study indicate that the epistemological obstacle of students' mathematical conceptual understanding based on the SOLO taxonomy from 35 students is 40% of students are in level 0 (prestructural); 11.43% of students are in level 1 (unistructural); 20% of students are in level 2 (multistructural); 25.71% of students are in level 3 (relational); and 2.86% of students are in level 4 (extended abstract). The obstacle of students that have at level 0 are all of conceptual understanding indicator. Students at level 1 and 2 have obstacles in indicators 2, 3, and 4. Students at level 3 have obstacles in indicators 2 and 4. Students at level 4 have obstacles in indicator 4.Keywords: Epistemological obstacle, Mathematical Conceptual Understanding, SOLO Taxonomy

Penelitian ini bertujuan untuk mengetahui pengaruh pendekatan pendidikan matematika realistik terhadap hasil belajar peserta didik kelas XI dalam materi lingkaran di SMA Panca Setya Sintang. Metode penelitian yang digunakan dalam penelitian ini adalah eksperimen dengan rancangan penelitian one-shot case study. Populasi dalam penelitian ini adalah peserta didik kelas XI IPA SMA Panca Setya Sintang. Sementara sampel yang digunakan yaitu peserta didik kelas XI IPA 2 yang berjumlah 24 peserta didik. Teknik pengumpulan data hasil belajar menggunakan teknik pengukuran dengan mmberikan tes soal essay dalam materi lingkaran kepada peserta didik. Untuk melihat kekonsistenan dalam pencapaian hasil belajar, maka setelah dua minggu kemudian diberikan tes tunda. Besar rata-rata nilai pada saat tes akhir adalah 53,82, sedangkan rata-rata nilai pada saat tes tunda adalah 55,56. Berdasarkan perhitungan uji t tes rata-rata satu sampel diperoleh nilai  dan  dengan taraf signifikan  hal ini berarti  maka  diterima artinya tidak terdapat perbedaan yang signifikan antara rata-rata nilai peserta didik pada saat tes akhir dan tes tunda. Maka terjadi kekonsistenan antara nilai tes akhir dan nilai tes tunda, hal ini berarti penerapan pendekatan pendidikan matematika realistik pada materi lingkaran berpengaruh terhadap hasil belajar peserta didikKata Kunci : Pengaruh, Pendidikan Matematika Realistik, Hasil Belajar

This study aims to determine and describe mathematical habits of mind strategies in solving problems of students with high and low mathematical abilities on the material of three variable linear equation systems in Senior High School 7 Pontianak. The research method used in this research is descriptive with a case study research form. The subjects in this study were students of class XI MIPA 3 in Senior High School 7 Pontianak and the interview subjects were two students with high math ability and two subjects with low math ability. The results showed that students with high mathematical abilities meet all components of mathematical habits of mind strategies, namely exploring mathematical ideas, generalizing, reflecting on the correctness of answers, identifying problem solving strategies that can be applied to broader problems, making questions and making examples. Students with low mathematical abilities meet three components of mathematical habits of mind strategies, namely generalizing, identifying problem solving strategies that can be applied to broader problems, and making questions.Keywords : Mathematical Habits Of Mind, Analysis, Problem Solving

The purpose of this study is to identify the mathematical concepts involved in the craft of weaving belungkur in the Penjulung Hamlet community in Teluk Keramat district, Sambas Regency. The research method used was a descriptive exploratory ethnographic method. The subjects of this study were 2 weaving belungkur artisans. The data in this study are the results of interviews, observations, and recordings. The results obtained from this study are that the numbers mentioned in regional languages include one meaning one, dua' meaning two, tige meaning three, ammpat meaning four, limma' meaning five, annam meaning six, tujoh meaning seven, lapan meaning eight, semilan meaning nine. and sepuloh meaning ten. The results of the study also found that the shape of the curved surface was in the form of a rectangle and at the edges of the bend there was also a triangular shape. Measurements using the limbs such as the length of the hand is dapa' and finger is kilan. All the results obtained can be integrated into learning math at school.

This research aimed to determine how to overcome the barriers of learning students in social arithmetic materials using Madura ethnomathematics in grade VIII B Islamic Junior High School Ashabul Kahfi Pontianak. The form of research used in this study is case study research. This study's data source is grade VIII B students of SMP Islam Ashabul Kahfi Pontianak, and the data were the initial and final test answer sheets and the results of interviews.. The results showed that Madurese ethnomathematics could overcome the barriers of student learning. Before using the ethnomathematics Madura tribe, students experienced errors in the concept of summation arranged downwards, errors in the concept of subtraction arranged downwards on numbers that have many zero digits, and errors in the concept of division, and errors calculating values in performing calculated operations. After using the ethnomathematics, the Madura tribe students can already operate using the way of counting done by traders, can already work on the problem of using the way of counting done by traders, and can already work on the problem by obtaining the correct value settlement. Although there is still students who still experience a slight error caused by the student's disability, all students cannot work using the correct steps.Keywords: Ethnomatematics, Learning Obstacles, Madura Tribe, Social Arithmetic