Puzzles similar to this one are often used to motivate the study of ideas about numbers and divisibility going back to the time of Euclid. However, a straightforward approach is possible, avoiding complications of the Ancient Greek kind. Before long, we may find that some deeper mathematical ideas are needed but we can begin intuitively.
A Tile Puzzle
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Ed, Paul and Erin will touch on our favourite Whetstones, and even some things that didn't make it to a Whetstone.