In the concrete operational stage, according to Piaget, children learn that despite changes in a substance's shape, its volume remains constant.
the stage before operations (2–7 years) Children continue to develop abstract thought processes and build on object permanence during this stage. They are thus capable of thinking about things that are not physically present, such as past events.
A child who needs to draw something or use objects is still in the concrete operational stage, as opposed to a child who can reason out the solution in their head.
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