Abstract
Mathematics is a discipline that can improve thinking skills. However, in reality, the mathematics thinking skills of elementary school students are still low. This is because the mathematics learning used is not optimal and still uses conventional learning. In the process of mathematics learning, there is an integration of character values with mathematics material. Character building through mathematics learning has not been done relatively. The current mathematical concept can be related to cultural activities called ethnomathematics. Through ethnomathematics, mathematics learning becomes more realistic. The purpose of this research is to build students’ character and improve student’s mathematic learning achievement through developing student worksheets with a mathematical approach based on ethnomathematics. The methods of the research were research and development by using steps including preliminary study, design, development, and dissemination. The result of the research is student's worksheets fulfill valid, practical, and effective criteria. The result of the validity of teaching media shows that the average number is 96 % with very good criteria. The effectiveness test shows that there is a distinction of student’s achievement before and after the treatment and the student’s achievement on average is increased. Based on the analysis of student's answers on student worksheets, four characters are built through the learning process with a realistic mathematic approach based on ethnomathematics, such as creativity, independence, curiosity, and nationality.
 Keywords: character building, realistic mathematics learning, ethnomathematics. 
Highlights
Mathematics is a discipline that can improve thinking skills
In reality, the mathematics thinking skills of elementary school students are still low. This is because the mathematics learning used is not optimal and still uses conventional learning
In the process of mathematics learning, there is an integration of character values with mathematics material
Summary
Efektifitas LKS diukur dengan membandingkan rata-rata prestasi belajar sebelum dan sesudah tindakan. HASIL DAN PEMBAHASAN Pengembangan produk perangkat pembelajaran berupa LKS berbasis etnomatematika dengan pendekatan realistik dalam konteks etnomatematika di eks karisidenan Pekalongan dilakukan dengan beberapa tahapan antara lain tahap pendefinisian, tahap perancangan, dan tahap pengembangan. Konsep LKS berbasis etnomatematika bertujuan agar materi matematika lebih mudah diterima dan dipahami oleh siswa. Pada tahap perancangan dilakukan penyusunan lembar validasi yang akan diuji oleh para ahli yaitu guru kelas di tingkat. Pada tahapan pengembangan terdapat tiga langkah yang dilakukan antara lain uji validitas, revisi, dan uji coba. Berdasarkan Tabel 2, dapat disimpulkan bahwa LKS yang dibuat berada pada kriteria sangat valid dan dapat digunakan sehingga LKS yang dikembangkan oleh peneliti layak untuk dijadikan perangkat pembelajaran matematika yang bertujuan untuk membentuk karakter siswa dan meningkatkan prestasi belajar. Namun peneliti memperhatikan beberapa masukan dari validator yang terdapat pada Tabel 3, sehingga ada beberapa
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