As time passes, mathematics is not only a mandatory learning at school which merely studies aspects and concepts but also unconsciously it is closely related to some activities in life and culture of society. Aspects, concepts and mathematical activities that related to culture can be studied and it is called as Ethnomatematics. The purpose of this research is to study and analyze the form of ethnomatematic activities in the process of making ornament motif in Tulungagung marble craft. Qualitative explorative was used as research method in this study. Ethnomatematics bridges between mathematics and culture. Ethnomatematic activities consist of 6 activities, namely counting, measuring, locating, designing, playing and explaining. The results of this study showed that the process of making marble in Tulungagung especially ornament motif contains mathematical activities. The etnomatematic activities in making process of marble includes counting, measuring, designing, and explaining.