Mathematical communication is one of the core competencies that needs to be formed and developed for students in the teaching of Mathematics in high schools. In this research, we have identified the manifestations of mathematical communication competence in 10th-grade students in teaching the topic “Coordinate Methods in the Plane”, based on a survey of opinions from 68 high school mathematics teachers in the provinces of Nghe An and Ha Tinh. Additionally, the research was also conducted with 32 10th-grade students who were assigned several learning tasks related to the topic “Coordinate Methods in the Plane”, with the aim of understanding the manifestations of students’ mathematical communication competence and the mistakes they made related to these manifestations. From there, propose several teaching methods to contribute to the development of mathematical communication competence in students in teaching this topic.