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Tool: The Doctor X Amazing Griddable Multiplication Contraption
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Go to: http://treeblurb.com/doctorx/calc.html (opens a new window)
Description: A 10 x 10 interactive grid with 10 possible colors to use. Start by drawing rectangles to count. Use the quick tour to consider multiplication, the distributive property, prime vs composite, square numbers, and more.
Technology Type: JavaScript 
Guide: User's Guide (opens a new window)
Author: Gordon Anderson
Language: English 
Cost: Does not require payment for use

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Courses: Math 1 Operations with numbers, Number sense
Math 2 Operations with numbers, Number sense
Math 3 Operations with numbers, Number theory