<![CDATA[It turns out that mathematics isn't just about the material in the classroom, but it's very close to our everyday lives. Even in the traditional games of Galasin or Gobak Sodor that we have played since childhood can be found a mathematical concept. Concepts of mathematics associated with cultural elements can attract the curiosity of learners to blend mathematical concepts with existing cultures and they can feel that math is part of their own culture. The purpose of this study is to develop a valid and effective product of teaching materials integrated with ethnomathematics of galasin games on vector material using PowerPoint for mathematics learning in Senior High School so that it can help teachers and students recognize, learn, and understand mathematics learning in the classroom. This study used a research and development method (RnD) referring to the Thiagarajan model or 4D model. This research was conducted at Bakti Idhata South Jakarta High School. Data collection included media expert validation tests, material, and elevation of student response. The result of the product development is a PowerPoint that integrates the ethnomathematics of the game with vector material. The results of the validation of the media and the material obtained an average score of "very good". So it can be concluded that the teaching material integrated with the ethnomathematics of this game is worthy to be used as a mathematical learning material.]]>
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