Question

How does commas change the meaning of a sentence? How can I ensure that my comma usage helps me communicate clearly?

Answer 1

Please put subject in the title. We math teachers do not know this stuff.

Answer 2

Check these sites for comma usage.

http://owl.english.purdue.edu/owl/resource/607/02/

http://grammar.ccc.commnet.edu/grammar/commas.htm

Answer 3

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.

Answer 4

These might be amusing!

http://www.humorhaus.com/hh1687.htm

http://grumpyoldbookman.blogspot.com/2004/11/two-pandas-and-some-commas.html