Abstract
Abstract Communication is an important ability for every human being to have. In this research, the focus of communication is on students’ mathematical communication skills. Mathematical communication is divided into two parts, namely written communication and verbal communication. If students have good verbal and written mathematical communication skills, then they are easier to express ideas and strategies and are able to write the stages of problem solving well, especially word problem. This is because word problem requires special attention in their solution. Therefore, it is necessary to analyze mathematical communication errors experienced by students in solving mathematical word problem. This study aims to describe the students’ written and oral mathematical communication skills in solving word problem. This type of research is qualitative-descriptive. The research subjects were three junior high school students. Based on the results of the study, there were still students who could not communicate their mathematical ideas well. Students’ written communication error is in converting problem sentences into mathematical models. Student’s writing problem solving are still not in order or coherent. The research finding indicated that the students’ verbal communication skills are better than their written communication skills.