What are Variables? shows how to express simple problems in the form of "mathematical sentences," and introduces the idea of using a symbol to hold a place for a value. Unknown numbers are explained and expanded to include variables. The colorful, engaging animations help bridge the gap between math as numerical manipulation and math that describes the physical world.

Originally released by Allied Video Corporation, 2004. Streaming video file encoded with permission for digital streaming by Infobase on April 30, 2015.

Lesson One: Writing Math Problems (4:15); --Lesson Two: How to Use a Variable in a Mathematical Sentence (8:12); -- Lesson Three: Example Problems (5:01); -- Review of Variables (1:38); .