Learn more about LeapFrog's Learning DVD Math Circus at br It’s a 1-2-3 ring circus of fun with 5 Quidget Worm song, a clip from LeapFrog's Learning DVD Math Circus. Watch the Quidget Family and Subtractobats perform high-flying feats of mathematics! In this astounding story, Leap, Lily, Tad and wacky Professor Quigley train numbers to count, add and subtract in a series of amazing circus acts. Numbers and Quidgets fly from trampolines, trapezes and cannons as they teach early mathematical concepts. As with all LeapFrog DVDs, humorous songs add to the fun and help reinforce educational concepts.