This study aims to produce a learning trajectory to help students understand the concept of percent uses the context of the arrangement of books for class V. This research is based on the PMRI which associated with 2013 curriculum learning. The method used in this research is design research type validation study. This research was conducted in elementary school with involving 8 students of class V. Researchers designed 4 learning activities percent using the context of the book arrangement. This research aims to contribute to the form of: Local Instructional Theory (LIT) about percent material. This research involves in cycle 1 involving 8 students in elementary school. Data were collected through student worksheets, pre-test, post-test, video, and interview. Data were analysed by comparing Hypothetical Learning Trajectory (HLT) and what happens during the learning process. The result of this study shows that through a series of activities that have been carried out help students in learning material percent.