“…Difficulties experienced by students are caused by several factors, including: (1) the learning approach factor, the learning approach used in learning lacks building students' thinking abilities and problem-solving abilities according to the opinion of Kansanen (2003). Some things that characterize learning practices in Indonesia are generally teachercentered learning; (2) the factor of study habits, students are only accustomed to learning by memorizing, this method is not so training in thinking skills and problem-solving abilities, this method is the result of learning that teachers normally use is conventional learning, where students are crammed with concepts, examples of questions, then the matter of practice according to Anwar, Budayasa, Amin, & de Haan (2012). Related to efforts to improve communication skills, teachers are expected to think about the Hypothetical Learning Trajectory (HLT) through realistic mathematics learning (RME) that will occur in mathematics learning, so that communication skills can be improved, Prahmana & Suwasti (2014) RME learning is learning that has 4 aspects namely using context, using models, interactivity, utilizing construction results, and interrelationships (Nuraida, 2017(Nuraida, , 2018.…”