Discover this rap from a nice-looking young American math teacher called Mrs Burk to help her students memorize area and perimeter. The new Teacher Tube provides the video, the script. Teach your students this song, and they'll prefer doing their math in English! ;)
http://www.teachertube.com/view_video.php?viewkey=734fe93831e3fb400ce8
http://www.teachertube.com/support_files/89.doc
You can watch her class rapping with her (her students are really normal elementary students, and you can also see the classroom with the lockers at the end.)
http://www.teachertube.com/view_video.php?viewkey=35da0b6f6ea37bcf8bcb
There are several other math raps, but some are more difficult to understand, and you may also not agree with her way to teach math!