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http://standards.nctm.org/document/chapter3/index.htm
This is the standards chapter in the Principles and Standards for School Mathematics of the National Council of Teachers of Mathematics. Select Number and Operations from the left column for across-the-grades standards. Information on Decimals and Percent can be found at grade levels 3 – 5 and 6 – 8. Use Search to find other locations for decimals and percent.
( http://standards.nctm.org/document/chapter3/index.htm )
http://www.geom.umn.edu/~demo5337/Group3/hist.html
Brief history of the Pythagorean Theorem with diagrams.
( http://www.geom.umn.edu/~demo5337/Group3/hist.html )







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