 The math topic is decimals, the subject is money, and Eddie once again finds himself in the middle as he and his friend Vincent help a Secret Service Agent (Laurie Metcalf) track down a counterfeiting ring. Eddie also consults with people whose job it is to create, safeguard, and trade our money supply, and learns something about foreign money from his Aunt Rosa and his friend Johnny. Things are not always what they seem, but Eddie realizes that if he uses his head---and what he learned in Miss Toliver s lesson----he can figure out the true value of a peso, a ruble or a questionable $100 bill.