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This research was conducted by analyzing the findings of learning obstacles. These findings are used as the development of learning trajectories of algerbaic thingking. Learning trajectories consist of systematic material about tables and diagrams in elementary schools. Problem modeling is represented through tables and diagrams from concrete levels to abstracts. This article aims to explain the process of abstraction that occurs in students through tables and diagrams. This research was conducted using qualitative methods and parts of didactical design research. This research was conducted on 5th grade of 10 students from two different schools. The results of this study are in the form of abstraction stages that are used to created algebraic thinking learning trajectories for elementary school students.