Flocabulary is awesome. This will be my first year in 4th grade but I used it for Math in 2nd grade. They have it for Math, Reading, Social Studies, and Vocabulary. My kids loved the Tens song. I always made sure that they learned the words before I really let them break it down. They would get so into the beat and just start having dance offs and not really saying the words. The promise of getting to break it down once they learned the concept and words was great incentive.
Also, I just found this video floating around pinterest. So funny and the DMSB was stuck in my head afterward.