What differences occur in children’s thinking in concrete operations as compared to formal operations?

Question

Please give examples

Answer 1

in concrete operational stage:
Evidence for organized, logical thought. There is the ability to perform multiple classification tasks, order objects in a logical sequence, and comprehend the principle of conservation. thinking becomes less transductive and less egocentric. The child is capable of concrete problem-solving.
Some reversibility now possible (quantities moved can be restored such as in arithmetic: 3+4 = 7 and 7-4 = 3, etc.)

Class logic-finding bases to sort unlike objects into logical groups where previously it was on superficial perceived attribute such as color. Categorical labels such as "number" or animal" now available.

in the formal operational stage:Thought becomes more abstract, incorporating the principles of formal logic. The ability to generate abstract propositions, multiple hypotheses and their possible outcomes is evident. Thinking becomes less tied to concrete reality.
Formal logical systems can be acquired. Can handle proportions, algebraic manipulation, other purely abstract processes. If a + b = x then x = a - b. If ma/ca = IQ = 1.00 then Ma = CA.

Prepositional logic, as-if and if-then steps. Can use aids such as axioms to transcend human limits on comprehension.

Answer 2

Formal operations is not a stage children ever get to. Formal operations stage is not until adolescence.
How do I know? I am a college Psychology instructor