Abstract: A slope of a line is an important concept of mathematics and it has many applications in the real world. This article discusses the enhancement of students communication through teaching the definition and the significance of the slope of a line. In this study, we apply teaching process including different activities such as: working in small groups; comparing and discussing solutions found between small groups; formulating hypotheses, testing, and assessmenting them in small groups in order to design a teaching situation in the slope of a line. Applying these strategies in teaching mathematics not only helps students understand better the meaning of the slope but also promotes their mathematical communication.
Keywords: Mathematical communication, teaching strategy, slope.