According to chapter 18 of Technology-Supported Mathematics Learning Environments, there are five ways in which technology is being implemented in the modern mathematics classroom. First, technology is used as a management tool to help teacher and student organization and efficiency and to "facilitate their classroom activities" (p. 278). Second, it is given the role of a communication tool in order to help teachers connect with students, parents, colleagues, and other schools. Third, technology is used as an evaluation tool which provides teachers with feedback as to students' progress in the classroom. Fourth, it becomes a motivational tool which encourages and engages students in their exploration of mathematics. And fifth, and supposedly most importantly, technology is used a a cognitive tool which works to represent difficult, abstract concepts in new ways which are easier for students to understand.
I think that all of these reasons are excellent and support the idea that technology is a necessary component of any mathematics classroom. As long as technology is not abused or solely relied upon, but rather implemented as one or all of these tools, it can only benefit the students and teachers who use it. I agree with the statement on page 289, "Equally essential is that we use technology thoughtfully... so that we are not merely implementing technology for the sake of technology itself."