Learn to Multiply by 4 the fun way with D.J. Doc Roc, the Hip Hop Hamster. Includes a music video from Rock 'N Learn's award winning Multiplication Rap DVD and a skip counting video to learn to count by 4 even faster. A randomized drill over facts from 4x0 through 4x12 helps learners check their progress. Once you've learned all the 4x facts, race the clock to see who can get the best time!