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Mathematical literacy is the ability of individuals to formulate, use, and interpret mathematics in various contexts. NCTM has formulated 5 competencies in mathematics learning, namely mathematical problem solving, mathematical communication, mathematical reasoning, mathematical connection, and mathematical representation. These five abilities are included in mathematics literacy abilities and must be possessed by all students. High-level thinking is a thought activity that includes aspects of problem solving, critical, creative, metacognitive to achieve certain goals, which in the domain of Bloom's Taxonomy conducts the analysis, synthesis and evaluation of a problem. The ability of mathematical literacy will encourage students to be able to think at a high level because in mathematics literacy students will be required to use all critical and creative thinking to be able to formulate and interpret mathematics in various contexts so that the highest level of mathematical skills (level 6) can be achieved.

The coastal area is a residential area of fishermen. In general, kids of fishing families only elementary schools. Therefore, children need to be motivated to be willing to continue their study in junior high school. Thus, needs and should be made a textbook based-on the coastal culture for junior high school (JHS), which was preceded by research activities. The purpose of this study to make the models of supplementary book of mathematics teaching-learning process based-on coastal culture for JHS students. This research activity was a qualitative research. The activities as follows: (1) exploring the coastal culture that can be used as a means to clarify concepts or materials about math, (2) By Focus Group Discussion activity, was prepared a draft of supplementary books of mathematics teaching-learning process based on coastal culture for JHS students. The result is the model of supplementary book of mathematics teaching-learning process based-on coastal culture for JHS students. The conclusion is that mathematics can have benefits in the lives of fishermen, it is expected that the school could become the foundation for improving the pattern of community life of the fishermen environment in the future for their children.