Julie understands that if 4 coins added to 5 coins equals 9 coins,then 4 coins subtracted from 9 coins equals 5 coins.This indicates that Julie has reached
A) a critical period.
B) the formal operational stage.
C) a secure attachment.
D) the concrete operational stage.

Question

Quizplus · Accepted Answer

Julie's ability to understand the mathematical concept of addition and subtraction suggests that she has reached the concrete operational stage of cognitive development. In this stage, children are able to think logically about concrete events and understand mathematical concepts, such as conservation and reversibility. The other options (a critical period, formal operational stage, and secure attachment) are not relevant to Julie's ability to solve this problem.

Julie Understands That If 4 Coins Added to 5 Coins