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This research aims to produce and see the effectiveness of interconnection-based mathematics-based teaching materials to facilitate the reasoning and problem-solving skills of high school students. The method used is research model development Borg & Gall with three phases: an introduction that includes literature review and analysis of student characteristics, stage of development which include determining the basic competencies and indicators, the analysis of the materials, writing materials,doi:10.31316/j.derivat.v4i2.157 fatcat:gvctt4dgujbwje3lrvbznfc2hq