This is a great handout on how to teach children waiting strategies and patience.
In the classroom:
Read the handout to the children. Ask them if they've ever had to wait for something they have wanted. Go beyond the puzzle example and come up with a list of other activities that they can do while waiting for a turn.
Then send one home with their parents so that they can implement the strategies at home.
(Note that I have no ownership over this handout)