hi from just answer.
yes, you do need to use the schedule on Page 10 of the publication 936. There is also a simple averaging method that you may qualify for that would eliminate the need for monthly or other averaging techniques.
A link to the publication is:http://www.irs.gov/publications/p936/ar02.html#en_US_2011_publink1000229991. A pdf version can be found at http://www.irs.gov/pub/irs-pdf/p936.pdf.
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