International Journal of Academic and Applied Research (IJAAR)   Year: 2024 | Volume: 8 | Issue: 6 | Page No.: 33-38 Development Of Ethnomathematics-Based Booklet Module On Batik Motif Simpang Lima Gumul Kediri On Learning Outcomes Of Square And Rectangular Subjects In Grade Iii Sdn Sukorame 2 Kediri Download PDF Auliya Dewi Mahardika, Drs. Nuriman, Ph.D, Dr. Ridho Alfarisi, S.Pd., M.Pd Abstract: This study aims to describe the Development Process of Ethnomathematics-Based Booklet Module in Batik Motif Simpang Lima Gumul Kediri and to determine the effectiveness of ethnomathematics-based booklet module for Grade 3 elementary school students. This research is a research and development using the Bord and Gall model which consists of 10 stages, but this research is only up to the 8th stage, namely the effectiveness trial. The subject of the study was a 3rd grade student of SDN Sukorame 2 Kediri. The data in this study used product validation, Independent Sample T-test, Relative Effectiveness and Student Response Test. The results of product validation obtained a score of 91 in the very valid category, the Independent Sample t-test obtained a score of 6,750 and the relative effectiveness level obtained a score of 71% with a high level of effectiveness. The student response test obtained a score of 82% in the very effective category. The ethnomathematics-based booklet module on batik simpang lima gumul Kediri is categorized as very effective to be used in grade 3 mathematics learning in elementary schools.