Kids love this entertaining way of learning basic addition or subtraction facts by performing along with D.J. Doc Roc! Positive lyrics, super-cool rap music, and high-energy action make this educational DVD irresistible for mastering math facts. Sums up to 18 and differences from 18 are easy to learn and remember with these 'add and subtract songs.' Ages 6 & up. Approx. 55 minutes.