*12 cards with double digit addition problems without regrouping
*student answer document with enough workspace for students to rewrite the problem and solve, as well as one open ended question about the process of adding two-digit numbers
*teacher answer key
I have used these in an independent math center and even posted them around the room to get the students up and moving as they solved the addition problems. Often times I will ask the students to "do 3 then see me" so I can do a quick check for understanding using the answer key before they continue.