Final answer:
Sylvia does not understand the principle of conservation, which is the knowledge that the quantity remains the same despite changes in form or appearance.
Step-by-step explanation:
Mrs. Pearson cut Judy's hot dog into eight pieces and Sylvia's into six pieces, leading Sylvia to cry because she thought Judy got more than she did. According to Jean Piaget, Sylvia doesn't understand the principle of conservation.
The concept of conservation means recognizing that the quantity of something remains the same despite changes in its form or appearance, which is typically understood in the concrete operational stage of cognitive development, occurring from about 7 to 11 years old.
Piaget would say that Sylvia doesn't understand the principle of conservation. Conservation refers to the idea that even if the appearance of an object changes, its quantity or size remains the same as long as nothing is added or removed. In this case, Judy and Sylvia's hot dogs were cut into different numbers of pieces, but the total amount of hot dog was equal for both of them.