A teacher found that an 11 year old class VI student could classify various types of quadrilaterals in different categories but had difficulty in understanding the proof "Sum of interior angles of a quadrilateral is 360°". According to Jean Piaget's Cognitive Theory, this student is in which stage?

• This stage marks the beginning of logico-mathematical thought and hence has importance for learning mathematics.
• The child in this period begins to demonstrate actions (Piaget terms these as ‘Operations’) indicative of the ability to think logically by physical manipulation of concrete objects.
• The child is no longer dependent upon perceptions or sensory cues.
• During this period, the child demonstrates the two major operations of grouping and conservation which are very much associated with the development of mathematical concepts.
• Children can't understand the generalizations and proofs easily, they face difficulty in comprehending.

​Hence in the concrete operational stage, the manipulates concrete objects and classifies them into different groups and also has difficulty in understanding proofs so according to Jean Piaget's Cognitive Theory, this student is in the concrete operational stage.

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