Puzzles with Numbers


Up to 100

The solutions to both puzzles are shown in the illustration.

The first puzzle was proposed by Henry E. Dudeney many years ago and was a little bit modified by Martin Gardner decades later. We've chosen only that its version where it is required to use the minimum number of signs.

The second puzzle was proposed by Martin Gardner as the logical development to the original one.

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Last Update
September 14, 2003

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