Implementation of learning is based on effective learning planning so that students can absorb the material being taught. The problem in this study is the use of a realistic mathematical approach based on the local wisdom of burning stones in the Tanimbar community. The purpose of this study was to instill students' thinking concepts in solving the local wisdom problems of the Batu Bakar community in Tanimbar by paying attention to a realistic mathematics learning approach. The type of research used is descriptive qualitative research. Implementation of learning conducted in Class VIII, SMP N 1 Kormomolin. The results of learning in this class can be concluded that (1) students' reasoning abilities are very good in understanding mathematical problems contained in the local wisdom of the Tanimbar community. (2) the use of a realistic mathematics learning approach based on tanimbar local wisdom is very good for use in mathematics.Keywords: Ethnomatematics, PMRI, Batu BakarAbstrakPelaksanaan pembelajaran didasarkan pada perencanaan pembelajaran yang efektif agar siswa dapat menyerap materi yang diajarkan. Permasalahan dalam penelitian ini adalah penggunaan pendekatan matematis realistik berbasis kearifan lokal pembakaran batu pada masyarakat Tanimbar. Tujuan penelitian ini adalah untuk menanamkan konsep berpikir siswa dalam menyelesaikan permasalahan kearifan lokal masyarakat Batu Bakar Tanimbar dengan memperhatikan pendekatan pembelajaran matematika realistik. Jenis penelitian yang digunakan adalah penelitian kualitatif deskriptif. Pelaksanaan pembelajaran dilakukan di Kelas VIII SMP N 1 Kormomolin. Hasil pembelajaran pada kelas ini dapat disimpulkan bahwa (1) kemampuan penalaran siswa sangat baik dalam memahami masalah matematika yang terkandung dalam kearifan lokal masyarakat Tanimbar. (2) penggunaan pendekatan pembelajaran matematika realistik berbasis kearifan lokal tanimbar sangat baik digunakan dalam pembelajaran matematika.Kata Kunci: Etnomatematika, PMRI, Batu Bakar

This study aims to determine the learning design of speech pattern material for class VIII students of SMP Negeri 3 Wertamrrian using a problem based learning model and determine students' ability to understand mathematical concepts through number patterns after using a problem-based learning model for class VIII students of SMP Negeri 3 Wertamrrian. This research was conducted at SMP Negeri 3 Wertamrian, Tanimbar Islands Regency in November 2022. This type of research is a qualitative research using a research design. Data collection methods used are research documentation, written tests and interviews. The data analysis technique used is data reduction, data presentation and conclusions or verification. The results of the study design research using a problem based learning (PBL) model on Bialngan Pattern material in class VIII of SMP Negeri 3 Wertamrian are as follows: (a) In the first and second meeting learning, the researcher reviewed the material related to the learning objectives to be achieved. (b) The researcher gave 2 problems to students, namely 1 problem at the first meeting and 1 problem at the second meeting. Then ask students to check the sentences or questions contained in the problem that they have not understood. (c) Researchers divide students into groups to solve problems. (d) Researchers assist students in solving the problems given by providing the supports that have been provided in the HLT that the researchers designed. (e) Researchers provide opportunities for group representatives to present each problem that has been discussed. (f) Researchers together with students discuss and check the results of the discussions that have been presented and evaluate the learning process that occurs. (2) The ability to understand mathematical concepts of class VIII SMP Negeri 3 Wertamrian on number pattern material after following the mathematics learning process using PBL is as follows: (a) In problem 1, students have a more dominant concept understanding ability in indicators 1, 3 and 4, namely restating each concept, presenting the concept in various forms of mathematical representation and using, utilizing and selecting certain procedures or operations in solving problems. (b) In problem 2, students have more dominant concept understanding skills in indicators 1, 3 and 4, namely restating each concept, presenting concepts in various forms of mathematical representation and using, utilizing, and choosing certain procedures or operations in solving problems.

This study aims to determine the ability of mathematical concepts in the material system of two-variable linear equations (SPLDV) based on the stages of APOS theory in terms of the learning styles. The type of research used in this research is qualitative research. The subjects in this study were 32 students of class X SMA Negeri 10 Tanimbar Islands Regency. The instrument used in this research is a) observation. Observation aims to observe student activity in understanding mathematical concepts in SPLDV material in applying APOS theory in terms of student learning styles, b) interviews. Interview sheets were used to obtain information related to understanding mathematical concepts in SPLDV material in applying APOS theory in terms of student learning styles c) Tests The test sheets in this study were given to students after being given mathematics learning with an understanding of mathematical concepts in SPLDV material in applying APOS theory in terms of student learning styles. The results of this study indicate that the APOS theory as an elaboration of mental construction from actions (actions), processes (processes), objects (objects), schemes (schema) improves students with visual learning styles, auditory learning styles and kinesthetic learning styles can improve students' abilities. mathematical concepts in the material system of two-variable linear equations (SPLDV).Keywords: APOS Theory, Learning Styles and SPLDV Concepts.AbstrakPenelitian ini bertujuan untuk mengetahui kemampuan konsep matematika pada materi sistem persamaan linear dua variabel (SPLDV) berdasarkan tahapan teori APOS ditinjau dari gaya belajar. Jenis penelitian yang digunakan dalam penelitian ini adalah penelitian kualitatif. Subjek dalam penelitian ini adalah siswa kelas X SMA Negeri 10 Kabupaten Kepulauan Tanimbar yang berjumlah  32 siswa. Instrumen yang digunakan dalam penelitian ini adalah a) observasi. Observasi bertujuan untuk mengamati aktifitas siswa dalam pemahaman konsep matematika pada materi SPLDV dalam menerapkan teori APOS ditinjau dari gaya belajar siswa, b) wawancara. Lembar wawancara digunakan untuk mendapatkan informasi yang berkaitan dengan pemahaman konsep matematika pada materi SPLDV dalam menerapkan teori APOS ditinjau dari gaya belajar siswa c) Tes Lembar tes dalam penelitian ini diberikan kepada siswa sesudah diberikan pembelajaran matematika dengan pemahaman konsep matematika pada materi SPLDV dalam menerapkan teori APOS ditinjau dari gaya belajar siswa. Hasil penelitian ini menunjukan bahwa teori APOS sebagai suatu elaborasi tentang konstruksi mental dari aksi (actions), proses (processes), objek (objects), skema (schema) meningkatkan siswa dengan gaya belajar visual, gaya belajar auditorial dan gaya belajar kinestetik dapat meningkatkan kemampuan konsep matematika pada materi sistem persamaan linear dua variabel (SPLDV). Kata Kunci : Teori APOS, Gaya Belajar dan Konsep SPLDV.