Ethnomatematics is a study of the different ways in which people solve mathematical problems and practical algorithms based on their perspectives. This study refers to various forms of mathematics as consequences which are embedded in cultural activities. Meanwhile, culture-based mathematics learning is one way that is perceived to make meaningful and contextual mathematical learning highly related to the cultural community and will be applied later in harmony with that community, as well as interesting and enjoyable learning. If this is done habituation from an early age will build the character of students. The researcher proposes possibilities for ethnomatematics to enggage the curriculum and have a relatively similar role in formal mathematics, namely; (1) substitute for school mathematics; (2) supply for school mathematics; (3) milestones into school mathematics: (4) motivation for school mathematics and (5) as a local content of school mathematics and scheme to develop student’s character.

Geometry teaches us not only about how to give appreciation for something, but also how to find connections that occur between geometry material and other lecture material. In addition, geometry also trains communication through exploration, discussion, conjecture and investigation. The problems that exist in basic geometry skills in a row are problems related to logic skills, drawing skills, visual skills, verbal skills, and applied skills. Based on geometric learning using analytical presentation, the problem of using axiomatic deductive is at the top, then the problem of perception. Misconceptions about visual processes and activities, and finally problems with the use of procedures, concepts, and principles

Penelitian ini bertujuan untuk mengembangkan bahan ajar pada mata kuliah Dasar-Dasar Matematika di Program Studi Matematika, Universitas Negeri Surabaya.Model yang digunakan untuk pengembangan bahan ajar pada penelitian ini adalah model pengembangan ADDIE yang terdiri 5 tahap, yaitu tahap Analisis (Analysis), Perancangan (Design), Pengembangan (Development), Implementasi (Implementation), dan Evaluasi (Evaluation). Sementara, metode yang digunakan untuk menganalisis data adalah metode ceklist pada setiap langkah pada Instructional Design Process Step/Action Checklist, jika tidak maka harus ada langkah alternatif yang dilakukan atau ada alasan yang relevan yang tidak mempengaruhi proses pengembangan. Perkuliahan Dasar-Dasar Matematika menggunakan bahan ajar blended learning telah disusun berdasarkan model pengembangan ADDIE. Setiap langkah pada Instructional Design Process Step/Action Checklist telah dilaksanakan dan telah menghasilkan bahan ajar berbasis blended learning. Penelitian ini diawali dengan pembuatan story line yang merupakan panduan dalam pengembangan bahan ajar. Dari hasil analisis angket respon mahasiswa, diperoleh lebih dari 75% mahasiswa memberikan respon positif tidak hanya pada bentuk perkuliahan yang menggabungkan antara perkuliahan online dan offline melalui blended learning tetapi juga tentang ketergunaan materi yang disampaikan secaran online melalui Vi-learn Unesa.Kata kunci: bahan ajar, blended learning, ADDIEThis study aims to develop teaching materials in the Basic Mathematics course in the Mathematics Study Program, Surabaya State University. The model used for the development of teaching materials in this study is the ADDIE development model consisting of 5 stages, namely the Analysis, Design (Design), Development (Development), Implementation (Implementation), and Evaluation (Evaluation). Meanwhile, the method used to analyze data is the checklist method at each step in the Instructional Design Process Step / Action Checklist, if not then there must be an alternative step taken or there is a relevant reason that does not affect the development process. Lectures on Basic Mathematics using blended learning teaching materials have been prepared based on the ADDIE development model. Every step in the Instructional Design Process Step / Action Checklist has beencarried out and has produced teaching materials based on blended learning. This research begins with the creation of a story line which is a guide in the development of teaching materials. From the analysis of student questionnaire responses, it was obtained that more than 75% of students gave positive responses not only to the form of lectures that combined online and offline lectures through blended learning but also about the use of material delivered online through Vi-learn Unesa.Keywords: ADDIE, blended learning, teaching materials