A pentominoe is a shape made up of five unit square and there there are exactly twelve different pentominoes.

Arrange the pentominoes to form a rectangle measuring 10 by 6.


Incredibly, there are 2339 solutions to this problem. Despite this, it still remains very difficult to find a solution; here is one solution:


  • Arrange the pentominoes to form a 12 by 5 (1010 solutions), 15 by 4 (368 solutions) or a 20 by 3 rectangle (2 solutions).
  • By using the set of pentominoes and an additional 2times2 tetrominoe, form a square measuring 8 by 8.
  • It is possible to take any pentominoe and, using nine of the remaining eleven pieces, form a figure that is mathematically similar – an enlargement, scale factor 3. Try to create similar figures for each of the twelve pentominoes.

For the definitive guide to dissection problems (and solutions) I would refer you to Stewart Coffin's amazing The Puzzling World of Polyhedral Dissections; found at: In particular, there is an entire section dedicated to Pentominoe problems:

Problem ID: 15 (Sep 2000)     Difficulty: 1 Star

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