More than 60 new puzzles and stunts based on the properties of numbers. Easy
techniques for multiplying large numbers mentally, identifying unknown numbers,
determining the date of any day in any year, interest rates worked in one.s head;
such entertainments as The Lost Digit, and Psychic Bridge; over 30 pages of magic
squares, triangles, cubes, much more. Inexhaustible source of stimulating
mathematical recreation.

Download File Size:3.66 MB

---