Are you teaching double digit addition and subtraction, but your students are still having trouble? This file will serve as a reference for your students so they remember the steps when adding or subtracting. It can even be used for parents to help them understand the many strategies for adding and subtraction. This file includes 2 different helper sheets each for addition and subtraction. Strategies discussed include: counting up, using base ten blocks, using a number grid, traditional/carrying over, combining groups, and adjusting and compensating.