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Number Gossip is an outstanding math tool that I learned about from the excellent blog ZarcoEnglish-Tool of the Day. Number Gossip is a search engine for numbers only. Type in any number and you will learn "everything you wanted to know about it but were afraid to ask". For example, when I search for the number 2 I learn: 2 is the smallest prime number, 2 is the only even prime number, the smallest field has 2 elements, for any polyhedron, 2 is the number of vertices plus the number of faces minus the number of edges. I can also learn the rare properties of two, and the common properties of two. Now that is pretty cool!

'The collection of lessons on this page are designed to target specific math concepts,often in real world settings and situations. Using Google Earth to present the concepts will engage students in a way that will illustrate the usefulness of the idea.'