Mathematics is a form of abstraction from problems that occur in life so that not infrequently many students who have difficulty in learning mathematics. No wonder if the current math is still a subject that is not liked by students. This is where the need for reformative learning of mathematics with an ethnomathematics approach based on Indonesian culture. This study explore the traditional game culture of Java and relate it to the learning of mathematics. This research includes descriptive qualitative research. Subjects in this study are children of Javanese who ever played "jiting-jitingan". Javanese tribes spread throughout most of the region. This study uses the subject of tribal children who live in Metro Lampung. From the information obtained further, the researchers connect with mathematics learning on the subject line and gradient. From the results of data analysis conducted by using descriptive analysis and discussion as follows: 1) The line equation can mathematics learning with ethnomathematics approach based on a traditional game is one form of an innovative approach to learning. 2) Integrating game and culture mathematics into activities that need to be done. Mathematical materials that can be taught through this game are addition, lines, and gradient.