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Animated videos about whole numbers, integers, and the number line at whyu.org
Properties of basic math operations notes and quiz from cliffsnotes.com
Mathematical Association of America's NumberaDay blog | Learn about the properties of individual numbers
VIDEOS: Observations about various numbers from Numberphile.com
"620: Almost Three" by Chris Burke (8/16/11) (Click right corner to view)
Webcomic #105 "Super natural number" by LanceAF (9/26/13)
Password and a contestant with a 6th sense...