Cross Number Puzzles—Addition and Subtraction

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This video demonstrates how to implement an activity from the NSF-funded Dynamic Number Project. In the years since this video was first created, the Dynamic Number activities have migrated from The Geometer's Sketchpad to Web Sketchpad— a free online platform for interacting with and creating dynamic mathematics models. You'll find a large collection of grades 1-8 Dynamic Number activities ready for classroom use at http://tinyurl.com/elemsketches.

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