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Puzzles.- 1 Hymn Numbers.- 2 Extra Homework.- 3 Crossnumber 1.- 4 Phone Number.- 5 Maximum Capacity.- 6 The Gilberts and the Sullivans.- 7 Stamps.- 8 Perfect Squares.- 9 Dance Tickets.- 10 The Cube of the Aztecs.- 11 Sarah's Number.- 12 Encyclopedia.- 13 Jim and Joe.- 14 Count Your Change.- 15 A Collection of Primes.- 16 Lucky Seven.- 17 Tables.- 18 The Professor's Railway Ticket.- 19 Raise the Flag!.- 20 Diggett and Trowell.- 21 Jumbles.- 22 Keeping Up With the Joneses.- 23 Piggy Banks.- 24 Perfect Numbers.- 25 A Tale of Scheherezade.- 26 Memorial Day Picnic.- 27 Professor Hex in Los Angeles.- 28 Fudge.- 29 Crossnumber 2.- 30 Round Trip.- 31 Jamie and His Calculator.- 32 Salaries.- 33 The Spy's the Limit.- 34 An Odd Game.- 35 More Stamps.- 36 Marbles.- 37 Square Inches.- 38 Flight of the Bumblebee.- 39 Another Discovery.- 40 Mrs. Hex Goes to Market.- 41 The Monkey and the Coconuts.- 42 Two Families.- 43 Friendly Numbers.- 44 The Hexes Tour England.- 45 Lead Soldiers.- 46 Computer.- 47 Chuck-a-Luck.- 48 More Marbles.- 49 Cannon-Balls.- 50 Farmer Watkins and the Devil.- Programming Tips.- Programs.- Solutions.