This, comparable to New Mathematical Diversions from Scientific American (report to follow-p. 967) is programmed for anyone who can compute beyond their check books and consists of recreational mathematics from the former magazine of that name. Like the Gardner book above, there are chessboard problems, paper problems, also verbal twisters here of a different type called Alphametics, and all kinds of digits you can fidget over. ""What two whole numbers, neither containing any zeros, when multiplied together equal exactly 1,000,000,000?"" Got it? Try others.