Design student worksheets based on problem-learning to enhance mathematical communication

Mathematical communication ability is one of the abilities that must be possessed by students in 21st century learning. Worksheets of students who have not yet integrated mathematical abilities will hinder the achievement of learning objectives. Problem based learning is a model that can improve mathematical communication skills. This study aims to design mathematics student worksheets of problem based learning models to improve mathematical communication skills. This research is a type of development research with the ADDIE model. The procedure of this study includes: analysis, design, development, implementation, and evaluation. This research is limited to the design stage. The subject of this study consisted of sleman junior high school teachers and students, class VIII Indonesia. The instrument of data collection consists of observation guidelines, interview guidelines and documentation sheets. Observation guidelines are used for the characteristics of students' mathematical communication. The interview guide is used to see the teaching material needs of the teacher. The documentation sheet manual is used to view curriculum implementation data that apply in the school. Data were analyzed by qualitative techniques. This study resulted in the design of student worksheets of problem based learning models according to the needs of students. Student work November is designed to improve students' mathematical communication. The results of the study show that the quality of the design products produced is based on the validity aspects and the student worksheets meet the criteria very well. This research can be expanded at the stage of developing, implementing and evaluating.