Geometri adalah cabang matematika yang diajarkan dengan tujuan agar siswa dapat memahami sifat-sifat dan hubungan antar unsur geometri serta dapat mendorong siswa untuk dapat berpikir secara kritis dan memecahkan masalah dalam kehidupan sehari-hari. Penelitian ini bertujuan untuk menganalisis kesulitan siswa kelas 4 SD Negeri Asmi 033 Kota Bandung dalam menjawab soal geometri. Penelitian ini menggunakan studi eksploratif dalam bentuk tes uraian tertulis pada materi geometri yang diberikan kepada 26 siswa SD Negeri Asmi 033 Kota Bandung. Hasil analisis menunjukkan bahwa terdapat kesulitan yang dihadapi siswa dalam menjawab soal geometri, kesulitan tersebut diantaranya adalah (1) siswa  kesulitan dalam penggunaan konsep, (2) siswa kesulitan dalam penggunaan prinsip, dan (3) siswa kesulitan dalam menyelesaikan masalah-masalah verbal. Hasil penelitian ini dapat dijadikan bahan pengembangan permasalahan geometri, khususnya pada materi keliling dan luas bangun datar di masa yang akan datang.Geometry is a branch of mathematics taught with the aim that students can understand the properties and relationships between elements of geometry and can encourage students to be able to think critically and solve problems in everyday life. This study aims to analyze the difficulties of fourth grade students of SD Negeri Asmi 033 Bandung City in answering geometry question. This study used an exploratory study in the form of a written description test on the geometry material given to 26 students of SD Negeri Asmi 033 Bandung City. The results of the analysis show that there were difficulties faced by students in answering geometry questions, such difficulties were (1) students difficulty in using concepts, (2) students difficulty in using principles, and (3) students difficuly in solving verbal problems. The result of this study can be used as material for the development of geometry problems, especially in the  material of circumference and area of  plane (geometry) in the future.

ABSTRAK This study focused on the characteristics of the development of teaching materials, teachers and students in mathematics learning based on Banten's culture. The Method which is used in this research are didactical Design Research and pre-experimental study, the subject of the study is a second grade of primary school student in the city of Serang where this research was taking place in academic year 2015/2016. The study stated that: Characteristics of teachers in mathematics learning based on Banten's culture,the teachers have the ability of metapedagogical skill in preparing the learning process which are divided into three stages: before, during and after learning. Meanwhile, before learning the subject, The Students have to learn more about Banten's culture, Also They discussed and solved the problems using it. On the last stage, the students reflected their knowledge and shared their impressions after learning.

This article aims at optimizing Sundanese ethnomatematics learning by improving the modeling and creative thinking abilities of primary school students using teaching materials developed with the Didactic Design Research method. The research subjects involved were first-grade and second-grade students of an Islamic primary school in the city of Serang, Banten with a total of 283 students. The data were obtained using learning obstacles test instrument, Initial Didactic Design and Revised Initial Didactic Design as the instruments. The results of the study show that learning barriers were experienced in the materials of addition and subtraction of numbers. The Initial Didactic Design was revised and developed using Sundanese ethnomathematics learning using endog-endogan and engklek games that resulted in the improvement of primary students’ creative thinking, geometry thinking, and algebra.

This research focuses on the leuit that functioned as a granary of the Baduy tribe. Researchers use ethnographic methods to obtain the data. This research finds that besides it is functioned as a place to store, Leuit can also be viewed as a symbol of food security for the Baduy community. After being analized mathematically, one leuit is able to support one person of Baduy for approximately 19 years. Moreover, geometric types and shapes of leuit are very interesting to study because of its uniqueness, and also its high Philosophical values.

This study aims to develop a learning media product that contains the local wisdom of the Baduy tribe. The method used in this research is an ethnographic study to collect data about the Baduy tribe buildings that contain geometric elements. After the data was collected, the researcher used the instructional design research method in the form of the ADDIE model with the aim of making learning media by integrating the local wisdom of the Baduy Tribe in learning geometry based on previous ethnographic studies. The subjects in this study were the Baduy people, teachers, and grade 4 students of one of the elementary schools in Serang City. The results of this study indicate that learning geometry by integrating the local wisdom of the Baduy tribe is very effective in the learning process, so that the learning media product in the form of geomatics cards that are made is ready to be used and implemented in the concept of the plane figure in elementary schools. This research is expected to contribute to education, especially in creating effective learning by integrating culture in mathematics learning in elementary schools.Penelitian ini bertujuan untuk mengembangkan sebuah produk media pembelajaran yang memuat kearifan lokal suku Baduy. Metode yang digunakan dalam penelitian ini adalah studi etnografi untuk mengumpulkan data-data tentang bangunan suku Baduy yang memuat unsur geometri. Setelah data terkumpul, peneliti menggunakan metode instructional design research berupa model ADDIE dengan tujuan untuk membuat media pembelajaran dengan mengintegrasikan kearifan local Suku Baduy pada pembelajaran geometri berdasarkan kajian etnografi sebelumnya. Subjek dalam penelitian ini adalah masyarakat Suku Baduy, guru dan siswa kelas 4 salah satu sekolah dasar di Kota Serang. Hasil penelitian ini menunjukkan bahwa pembelajaran geometri dengan mengintegrasikan kearifan local Suku Baduy sangat efektif diterapkan dalam proses pembelajaran, sehingga produk media pembelajaran berupa kartu geomatika yang dibuat telah siap digunakan dan diimplementasikan pada  konsep bangun datar di sekolah dasar. Penelitian ini diharapkan dapat memberikan kontribusi dalam dunia pendidikan khususnya dalam menciptakan pembelajaran yang efektif dengan mengintegrasikan budaya pada pembelajaran matematika di sekolah dasar.