10 Penny Puzzle - a circle packing problem


Can you insert all 10 pennies into the square opening?

Looks easy, but maybe not…. Great fun in a puzzle that may take you 2 minutes or 2 days.

Circle packing is a branch of recreational mathematics where the aim is to pack n unit circles into the smallest possible square.  As I thought about it , it occurred to me that this may make a fun puzzle to do with pennies.

The 10 circle problem appeared to the best challenge as the solution is not at all obvious.   I precision cut the opening such that the pennies will just fit in with no room to spare.  The text is all deeply laser engraved and the backing is heavy duty floorboard so the puzzle has a great weight and feel.  The puzzle comes unsolved as there is a temporary home for the tenth penny which you must find a way to insert into the large opening.

The solution is provided.  Made in our Hudson, Florida shop.

Add to Cart:

  • Model: 10Penny
  • Shipping Weight: 0.33lbs
  • Manufactured by: Creative Crafthouse

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