Abe is giving his children some brain teaser challenges. he asked, "if a smot is bigger than a hek, a kom is bigger than duj, and a smot is bigger than a kom, then which is bigger: a hek or a duj? " his younger child wants to draw pictures of each item, but his older child can do it mentally. his younger child is while his older child is

His younger child is concrete operational, while his older child is formal operational. Both are stages of the development of children's thinking. The concrete operational stage covers from 8 to 12 years and the child think more rationally about the objects he sees or with which he can work. The formal operational stage occurs after 12 years and at this stage, the thought is more rational and operations can be performed in an abstract way.

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