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This study aims to analyze: 1)The mathematic lesson plan which is developed through model of problem-based learning contextually on Java culture (PBL-CJC) to meet valid, practical and effective criteria, and 2) The Improvement of mathematic communicative understanding ability of junior high school students using the PBL-CJC lesson plan. This research is a development research conducted through two steps. The first step, developed the lesson plan using 4-D model, and then tested the lesson plan in class VIII / 2 and VIII / 1 SMPN 1 Beringin. And the result were obtained ; 1) PBL-CJC lesson plan have valid criteria , practical and effective 2) there are Improvement of students' mathematic communicative understanding ability using PBL-CJC lesson plan.

proceedings of the 3rd annual international seminar on transformative education and educational leadership (aisteel 2018)

The Development of Mathematic Lesson Plan to Increase Mathematic Communication Ability Students Through The Model of Problem Based Learning Contextually On Java Culture