I will be moving from 5th to 3rd grade this fall. You're scaring me when you talk about whiners!!!!! Well, never having any teaching experience with 3rd graders, I, of course, have lots of advice for you

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Do you make use of safe seats? If so, what about going there after 1 redirect? I've used red, yellow, green cards with arguers in 5th grade. They have been very successful. One argue - give the green card. Argue again - give the yellow card. Say one more argumentative word - give the red card. Any last words? - go to the safe seat. I actually had a kid who argued about EVERYTHING under the sun who eventually stopped arguing using the red, yellow, green card system! It was pretty amazing to watch it work.