The well known Math Forum (formerly from Swarthmore College), has meta-pages specifically for elementary school math teachers. One of the highlights of the Problems and Activities section is Ruth Carver's elementary...
In the introduction to this site we learn that, "A fundamental result of geometry, used often in secondary and collegiate mathematics, is the equality of ratios of corresponding sides in similar triangles." Accordingly...
How much liquid can that glass hold? What are the dimensions of that package that's heading off to a friend overseas? Answers to both of those questions (and many more) can be found in this lovely interactive feature on...
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