Arthur and the New Kid — Marc Brown

Arthur and his friends aren't sure of what to make of Norbert, the new kid in their class. He wears a jacket and tie, sits at the fourth graders' table in the lunchroom, and buys two slices of pizza for lunch. But when Norbert helps Francine answer a difficult math problem and scores two soccer goals during recess, Arthur and his friends learn that the new boy at school is different from what they first thought.