Three year-old john was upset that his sister had two cookies and he only had one. when john’s mother broke his cookie in half, though, john felt that things were fair again because he now had two pieces. according to piaget, john is lacking

The understanding of conservation

Explanation:

The law of conservation states that the amount of something is preserved even when the shape is altered or even when that thing is deformed.

For example putting the same amount of water in a short big glass and transferring it into a long thin glass doesn't change the amount of water that was initially in the first big short glass and children may not understand this at a certain age until they grow up to understand the law of conservation.

Not fair

Explanation:mandem wanted 2 cookies innit he still has the mass of 1 cookie while the geezer of a another gave the mass of 2 cookies to the sister