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." Approx. 55 min. Ages 6 & up.