Mindstretching Puzzles

Contains 90 puzzles selected to increase your problem-solving powers. They include cryptarithms, asphmetics, simultaneous equations and layered thinking - more advanced puzzles than average, challenging you to replace letters with digits, break codes and much more. Answers are included. Give your brain the kind of workout that will make you sharper, smarter, a better problem solver. Introducing the strange new world of cryptarithms, alphametics, simultaneous equations, and layered thinking-puzzles that will challenge you to replace letters with digits to find words, flatten cubes into two dimensions, find missing persons, break codes, and much more. It's not how much math or algebra you know, but how flexible your thinking is. 96 pages, 60 b/w illus., 5 3/8 X 8 1/4. Give your brain the kind of workout that will make you sharper, smarter, a better problem solver. Introducing the strange new world of cryptarithms, alphametics, simultaneous equations, and layered thinking -- puzzles that will challenge you to replace letters with digits to find words, flatten cubes into two dimensions, find missing persons, break codes, and much more. It's not how much math or algebra you know, but how flexible your thinking is. Table of Contents......Page 4 Introduction......Page 6 Questions......Page 8 1......Page 10 10......Page 14 20......Page 17 30......Page 20 40......Page 22 50......Page 29 60......Page 33 70......Page 39 80......Page 47 90......Page 51 Answers......Page 55 Index......Page 95