A teacher is giving preschool students clay to play with. Some of the students get the clay in the shape of a thin block while others get a ball of clay. Both shapes have the same amount of clay but some of the students with the thin block begin to argue that the students with the ball of clay have more. The teacher is not able to successfully explain to the A teacher is giving preschool students clay to play with. Some of the students get the clay in the shape of a thin block while others get a ball of clay. Both shapes have the same amount of clay but some of the students with the thin block begin to argue that the students with the ball of clay have more. The teacher is not able to successfully explain to the students that both shapes hold the same amount of clay. Which of Piaget ' s stages are these students in ? formal operational concrete operational preoperational sensorimotor