tears, tears, tears, "but mommmmm, this is going to take foreevvvvveeeerrrrrrrrrr. I am never going to go jump on the trampoline and this is too hard."
This was #1 this morning. I had him go get a timer (since there are now 4 stuck to the side of the frig) and said do one problem a minute. In less than 10 minutes all of the math was done. He was flying through it. So, try a timer with your dawdler. It may just work-it did with mine.