Tag Archives: puzzle

Half a pizza and half a balloon

This is a puzzle If you’ve ever actually tried to divide a pizza into 15 equal pieces – and I mean the kind of dividing that uses a knife or a cutter or piano wire – you’ll find that knowing … Continue reading

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Making Change – A Sam Lloyd puzzle

This is a puzzle, taken from the famous puzzle producer Sam Lloyd, complete with original illustration.  This puzzle is old: A lady bought a boquet at the florists for thirty-four cents and had a one dollar bill, a three cent … Continue reading

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The Lewis Carroll problem

This is a puzzle. Lewis Carroll, the author of Alice in Wonderland, was also a mathematician. In his diary for 1890, he wrote the following statement: is always the sum of two squares where x and y are a pair … Continue reading

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A Multiplication Nomograph

This is a puzzle. If you look at the picture below: you see numbers on the left, in red, and numbers on the right, in red.  If you connect the number 2 on the left with the number 4 on … Continue reading

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Coins and Change

This is a puzzle. Imagine the country of Jockland, where coins exist in the following denominations: 3~, 5~, 30~, 50~, 300~, 500~, etc., with ‘~’ their equivalent of the penny. But there is no single-~ coin. If people need to … Continue reading

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Skinny Multiplication Table

This is a puzzle. Imagine a look-up table like this: and that this table is used for multiplication. Obviously, this multiplication table must be used differently from the usual one, because it is a one-dimensional table, long and skinny. To … Continue reading

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