Scholastic has created a site called StudyJams!, full of over 200 short, upbeat educational videos on math & science topics. The videos are organized by topic, so you can just find the video that matches the educational concept you're covering in class! You may print out the lyrics to sing along to songs and you may test yourself on a variety of topics.
How to Get this Freebie: View the videos at Scholastic's StudyJams! site