Great visual for students of different strategies they may use to solve 2-3 digit addition and subtraction problems without regrouping. After a week or so of instruction and practice of each strategy, I use the green box in the corner for the students to assess their own understanding. They draw a happy face if they understand the strategy, or a sad face if they are having trouble with it. This lets me know if they are ready to move on to the next strategy or if we need to work on the one before it some more. These pages can be kept in their math binders or anywhere they can easily access it to use it as a "cheat sheet" if they need reminding on how to properly apply the strategy.