According to Piaget, the concrete operational stage spans which approximate age range?

1. Table 3.2 lists the third Piagetian stage as concrete operational. 2. Its approximate age range is given as seven to eleven years. 3. Children at this stage reason logically about concrete events and classify objects. 4. They can perform reversible mental operations on representations of objects. 5. Hence concrete operational covers seven to eleven years. _Source: syllabus Psychology Ch 3 "Human Development", p. 48, Table 3.2 Piaget's Stages_