The purpose of this study was to measure the effect of classroom practices of using communication tools, collaboration skills, digital skills, and software skills of teachers on the communication behaviors of students during mathematics instruction. A cross-sectional online survey was conducted among 466 mathematics teachers in Nepal. The primary statistical techniques applied in the data analysis were mean, standard deviation, one-sample t-test, and structural equation modeling (SEM). The results showed that the level of skill transformations of mathematics teachers in digital skills was found to be significantly low. Moreover, practices of using communication tools, collaborative skills of teachers, digital skills enhancement of teachers, and software skills enhancement of teachers were found to be significant predictors of the communication behavior of students. The results of this study suggested that teachers' technological empowerment is essential for developing digitally competent teachers who can transform the traditional mathematics classrooms into an online mode that is more constructive, collaborative, engaging, and supportive to the learners in a flexible and joyful learning environment. The study contributes to providing the knowledge of digital instructional skills of mathematics teachers to the communication behavior of the students. Moreover, the study gives an insight into using multi-group SEM in studying teachers' technological skills on students' learning of soft skills, such as communication behavior.