Posted by kathy on Tuesday, June 22, 2010 at 1:28pm.
Please put subject in the title. We math teachers do not know this stuff.
Check these sites for comma usage.
http://owl.english.purdue.edu/owl/resource/607/02/
http://grammar.ccc.commnet.edu/grammar/commas.htm
http://grammar.ccc.commnet.edu/grammar/commas.htm
This website has very good explanations and examples of when to use commas and when not to use them.
Without specific examples from you, it's difficult to tell you much more than this.
These might be amusing!
http://www.humorhaus.com/hh1687.htm
http://grumpyoldbookman.blogspot.com/2004/11/two-pandas-and-some-commas.html
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