This study aims to develop teaching materials based on the local culture of Jombang in an ethnomathematics perspective on the material for flat shapes used in mathematics learning for class IV on the circumference and area of flat shapes. The research method used is development (R&D) with the ADDIE development model which consists of five stages, namely analysis, design, development, implementation, evaluation. The data collected is related to the effectiveness of teaching materials. The subject of the product trial was carried out on 20 class IV students of SD Negeri Mlancu 2. The instrument used was student learning outcomes. From the results of trials that have been carried out, the effectiveness of teaching materials based on Jombang local culture in an ethnomathematics perspective on flat shape material is 85% with effective details. From the results of this study, it can be concluded that teaching materials based on the local culture of Jombang in an ethnomathematics perspective on flat shape material can be used in learning mathematics on the circumference and area of flat shapes. Keywords: elementary mathematics, ethnomatematics, local culture of jombang
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