I recently stumbled on this page from the math learning center, the people who publish Bridges, our math curriculum. Check out this site for insight into some of the stategies kids will be taught. I was particularly interested in the section on subtraction of the counting numbers and how the concept can be transitioned to the "borrowing" or "trading" algorithm.
http://www.mathlearningcenter.org/resources/gene/play-on-numbers/default.asp#
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