Learning Process of Decimals through the Base Ten Strips at the Fifth Grade

This research aims to produce a learning trajectory that can assist students in studying decimals. The method used in this research is design research with the initial stage at preparing for an experiment, the second stage of the design experiment and the final stage of retrospective analysis. The learning approach used is Indonesian Realistic Mathematics Education (PMRI). Subjects in this research are students of the fifth grade of Elementary School 121 Palembang, Indonesia. Data collection is done through student activity of observation, video recording of events in class, the collection of student work, the collection of the test result of student and student interview. The collected data were then analyzed retrospectively with the results indicating that the learning path obtained can help the students in studying decimals. The learning trajectory includes recognizing the use of decimals in everyday life, recognizing the base ten strips, understanding the value of decimal places through the activity of populating the place value table, showing the value of the decimal places through the activity of arranging the base strip 10, representing the decimal number to the image through the activity Draw base ten strips and use base ten strips-image to complete decimals operation.