Abstract
The purpose of this study was to analyze the mathematical creative thinking ability test instrument in open-ended problems with ethnomathematic nuances. The aspects that must be possessed in a mathematical creative thinking ability test instrument consist of: fluency, flexibility, originality, and elaboration. These four aspects are contained in open-ended questions. Open-ended questions are questions that can be worked on with several answers or various settlement strategies. Ethnomatematics applied to open-ended questions is batik. Batik that has various styles should be able to explore the mathematical creative thinking ability. The method used to collect data on mathematical creative thinking ability is the essay test method which consists of 5 items. The data analysis technique used is qualitative and quantitative data analysis. Qualitative analysis was carried out by examining the validity of the content. Meanwhile, the quantitative analysis was carried out by using the classical test theory approach which the calculations were assisted by the Microsift Excell program.
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