AbstractMathematical communication is one of the skills that everyone needs to have to succeed in studying and working, especially in the 21st century era and the industrial revolution 4.0. Mathematical communication skills are very important for students to present arguments in presentations and discussions. These skills can be developed through problem-based learning model. However, student worksheets to support these models have not been extensively created. Therefore, this study aims to develop student worksheets to support problem-based learning models. In student worksheets, mathematical communication skills were integrated into activities. Furthermore, it uses a study and development model including Analysis, Design, Development, Implementation, and Evaluation (ADDIE). The subjects were 50 8th-grade students and 2 mathematics teachers at a Junior High School in Yogyakarta, Indonesia. Here, the teacher is an expert in judging. Collection of data was conducted through observation techniqu.....