This is the same as the Addition Strategies Notebook Lesson also available from my store.
By request, I'm making it available via PDF.
It was designed for 2nd graders and includes 4 addition strategies: Decomposing Numbers, Open Number Line, Base-10 Blocks, and Friendly Numbers. It includes an explanation of each strategy and a few practice problems.
These strategies are much more effective than simply memorizing the algorithm in teaching your students how to add with regrouping