I dont know if this has happened to you but when I teach two-digit addition my kids usually get really good at adding with or without regrouping separately. When I give them a little bit of both together in one activity though, it's like I never taught it and they never learned it :/. On that note, I decided that they needed more exposure to mixed two-digit addition equations with/without regrouping and made this activity.
This file includes:
(all of these are in color & b/w)