No...we're using Investigations
I can't help...last year my kiddos either got it, or they didn't get it!
This year, we've switched to Scott Foresman/Investigations. We use the joint usage plan, but I'm only using Investigations (unless I really need the basal).
We've done double digit addition and subtraction with and without regrouping for a few weeks--except we don't teach a formula.
There is no vertical addition, add the ones, carry, add the tens, etc. Instead, the students are given a story problem and then need to visualize it, draw it, and solve it.
I'm amazed at how well they have done. We spend our 70 minute math time on solving one or two problems and then explaining the strategies that we used.
My kids get it--they can solve the problems, and the majority have progressed to figuring out strategies so that they can solve the problems in their heads...when they do use the numbers, 99% of the time they start with the tens, and then move to the ones. It was tough to watch--but their strategies work!