The Double Fun Circus is coming to town. The Math Monsters are practicing adding doubles to get ready for the big show. Spend time with a shopkeeper in the real world who explains how she uses adding doubles to make her job easier. Please note: This episode is also available in Spanish.

Originally released by Slim Goodbody, 2000. Streaming video file encoded with permission for digital streaming by Infobase on April 18, 2015.

Math Monsters-Doubles and their Neighbors (14:00); .