Because student do not see relevance. In spite of the fact that they use it every day, each class is a challenge to make it interesting by relating the topic to a real word experience. I do that through my own background as an engineer and the use of TED and YouTube.

Fortunately our classrooms are equipped with video projectors connected to a computer. This allows the import of a variety of presentations. And teaching math requires keeping the students engaged at all times.

Most students hate math and can't find any useful purpose. Ignoring of course they use it every day and the technology they have would not exist without it. I use TED discussions to engage students and have asked them to prepare papers on famous mathematicians. These provide good discussion and have increased interest.