Elementary-level math becomes an exercise in humor and fun when kids open this funny cartoon-illustrated fantasy. The story's cast of characters includes Lostis Marbles, the mayor of Mathopolis, who loves numbers but usually gets them all mixed up . . . his assistant Trusty Dusty, who helps the mayor keep track of his math mix-ups . . . Mongrel Smith, the town's stray dog . . . and math superheroes, who use different methods to solve all kinds of...