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This study aims to design and develop learning trajectories in triangular and quadrilateral material and examine students mathematical understanding by using the local instruction theory. The research method used is design research with 3 stages, namely preliminary design, teaching experiment, and retrospective analysis. The instruments in this study were tests and non-tests. As for the subjects in this study were seventh-grade junior high school students as many as 40 people. This study describes how the learning trajectory developed can affect mathematical comprehension skills. The final result of this study is an increase in students mathematical understanding skills using the local instruction theory