Outlaw "I'm Done!" I LOVE this post from Kady at The Teacher Trap. She makes some really good points and includes suggestions for helping kids change their mindsets about rushing through their assignments.
Maintain Positive Expectations: And Family Contact: This is a note from the teacher. The student gets to see what they were doing well and gets to have their parents also be informed of what they were doing well. How I Became a More Positive Teacher