I thought this would be a cute way to incorporate a lesson in our regular playdough play. It was a little bit hard for M because many of the pieces were fairly similar. I think if I were to do it again, I would start with only a couple of balls with a huge difference in size and then work our way up to more balls.
Playdough Size Classification
Theme: Preschool Skills
How to: Roll some balls of various sizes and have your child line them up according to size. M also decided to stack them in size order.