This study aimed to develop learning modules and determine the feasibility of using Arfak ethnomathematics-based learning modules on flat-shaped material. The module trial was carried out on class VII A students at SMP Negeri 10 Manokwari in the 2022/2023 academic year. Module development is carried out using the ADDIE development model, which consists of five stages: analysis, design, development, implementation, and evaluation. The instruments used in this study were validation sheets, student response questionnaires and learning achievement tests. The data in this study were analyzed by grouping data based on variables from the respondents, tabulating data based on the results of the instruments that had been obtained and calculating according to the formula. Module validity analysis obtained an average content validation value of 87% and an average design validation value of 92%, both of which met the very valid category. The implementation results obtained an average value of 95% for the student response questionnaire, fulfilling practical criteria. Analysis of the effectiveness based on the learning outcomes test obtained a complete percentage of 87.67% fulfilling the good category, and the average score of the learning outcomes test for 15 students was 89. Based on the results obtained, it can be concluded that the developed module is feasible to use because it satisfies valid, practical, and effective criteria and can help improve students' mathematical connection abilities and improve students' literacy and numeracy skills.

Keywords:Ethnomathematics artifact, valid, practical, effective, feasible