I designed a set of circle puzzles to help work on color recognition. I printed them out on cardstock paper and cut them out. Next I cut along the lines in the center of the circles to make two halves and then laminated all pieces.
I set separated the circle halves into two piles and mixed them up. The children picked a half from one pile and then found the the matching half in the other pile. The then put the two halves together to form a circle.