Learning mathematics through cultural environment (ethnomathematics) will be more meaningful for indigenous student in understanding school mathematics concepts. This is because ethnomathematics can be a bridge for indigenous students to understanding that mathematics is concrete, simple, and close to student culture daily activities. One of the local cultures that is the pride and closely attached to the people of East Nusa Tenggara, Indonesia is woven fabrics. Woven fabrics is one of the cultural objects where various philosophies are expressed and is the hallmark of each tribe in this province. Therefore, woven fabrics can be used as a medium for learning mathematics based on the results of ethnomathematics studies. Based on ethnomathematics on the woven fabrics of the West Amarasi Society (a small village located on the western tip of the Timor Island East Nusa Tenggara), this paper discusses how to design number pattern learning for Junior High Schoolers in this place. This topic is often considered a difficult topic for local junior high school students because the context taught is abstract and almost invisible in everyday life whereas it is integrated in local woven fabrics. In addition, this paper also discusses how to implement this number pattern learning design in real class

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