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, such entertainments as The Lost Digit, and Psychic Bridge. Over 30 pages of magic squares, triangles, cubes, more. 76 illustrations.
Reprint of the original edition.
|Availability||Usually ships in 24 to 48 hours|
|Author/Editor||Royal V. Heath|
|Grade level||7 and Up (ages 12 and up)|
|Dimensions||5 3/8 x 8 1/2|