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The Doctor X Amazing Griddable Multiplication Contraption

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Visit this site: http://treeblurb.com/doctorx

Author:Gordon Anderson
Description: Click a color from the left of this 10×10 JavaScript array, then paint the grey boxes with it to illustrate how rectangular area, multiplication, and the distributive property interrelate. As products color the grid, the column on the left dynamically keeps count of the 100 total uncolored and colored boxes. Click the "x" button in the lower right to reset and start over.

Levels: Elementary
Languages: English
Resource Types: Web Interactive/Java
Math Topics: Multiplication, Patterns/Relationships

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