A young child can engage in symbolic play but cannot yet take the perspective of another person and becomes easily upset by events he/she cannot control. Which of the following stages given by Jean Piaget applies to this child's level of development?

According to Jean Piaget, mathematical knowledge is primarily acquired through:

How does Piaget's theory explain children's process of learning mathematical concepts?

A Class 2 teacher notices that when she pours water from a short, wide glass into a tall, thin one, her students insist that the taller glass holds more water. Based on Piaget's theory, which stage of cognitive development are these students most likely in, and what concept are they struggling with?