No 3 in a series of posts based on Thinking Mathematically (1985) by Mason, Burton, Stacey
This is a classic task for working systematically:
It was once claimed that there are 204 squares on an ordinary chessboard. Can you justify this claim?
I like this way of stating the problem, rather than just “how many squares on a chessboard?” because it gets straight to the nub of the issue – we are looking at different sized squares, some of which overlap.
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