“An Ingenious Match Puzzle”

From Henry Dudeney:

dudeney match puzzle

“Place six matches as shown, and then shift one match without touching the others so that the new arrangement shall represent an arithmetical fraction equal to 1. The match forming the horizontal fraction bar must not be the one moved.”

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“It will be seen that the second I in VII has been moved, so as to form the sign of square root. The square root of 1, is, of course, 1, so that the fractional expression itself represents 1.”

July 9, 2009January 21, 2013 | Puzzles