According to Piaget’s theory a three year old and nine year old such as reasoning, perception, thinking, and logic. During the seventh and eighth year of childhood a child switched from the preoperational stage to the concrete operations stage. This explains why a three year old and nine year old child would have largely varying thinking pattern. To begin, a three year old cannot understand that changing the shape of an object doesn’t change the amount. An example could be water in a glass being poured into a taller thinner glass. The three year old would think the tall glass had more water, while the nine year old child would realize through logic that the same amount of water is present. This is because the three year old hasn’t developed