Hi there.
We have these two following structures:
A number of + plural noun + plural verb...
The number of + plural noun + singular verb...
And here is the sentence that makes me confused:
"
The number of people who understand his ideas exceed his expectations." [http://
esl.about.com/od/advancedgrammar/a/sentrans_one_2.htm]
because "The number of people" is the subject of the verb "exceed". I think it should be "exceeds" instead of "exceed".
Please tell me the correct one.

Thank you very much.