My experience was 4th grade, we were in with 5th graders. It helped that we had a very good teach. It wasn't terribly different from a regular school year, really. One grade did assigned work while the teacher addressed the other and then a switch. And of course there we things we did the same/together.
It was pretty much a non-event but, again, we had a very good teacher that we all liked and respected so there weren't any problems. If you're fortunate enough to also have a good teacher for your child's class this could be a very good experience!
Oh. lastly, I did learn a few things from over-hearing the 5th graders' lessons, fwiw. I distinctly remember that was when I learned the only number you can't divide is zero~~when Mrs. Van Dellan taught it 5th grade math students. 
Julie
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