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NCTM
The Historical Perspective mentions the National Council of Teacher
of Mathematics. If you would like more information about this organization,
check out this site.
http://www.nctm.org/index.htm
Fractions Main Page
This is an excellent site for factors, fractions,
and operations with fractions.
http://www.aaamath.com/B/fra.htm
Adding Fractions
http://www.sosmath.com/algebra/fraction/frac3/frac37/frac37.html
Subtracting Fractions
http://www.sosmath.com/algebra/fraction/frac3/frac38/frac38.html
Extended Order of Operations
If you begin the tutorial, you will
be led to some examples of the extended order of operations.
http://www.amby.com/educate/ord-op/
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