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Mathematical Puzzles


Difficulty: MediumPuzzle 1

Which square, which circle, and which triangle has the closest area to the doughnut shape on the left?

The drawings are to scale, so you might be able to judge it, as well as working the actual areas out.

Puzzle Image

[Ref: ZKRC] © Kevin Stone

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Difficulty: EasyPuzzle 2

Starting in the bottom left corner and moving either up or right, one square at a time, adding up the numbers along the way, what is the largest sum which can be made once you have reached the top right corner?

Puzzle Image

[Ref: ZNGR] © Kevin Stone

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Difficulty: EasyPuzzle 3

Each empty white square in the grid contains one of the numbers 1, 2, 3,..., 8. Each of the horizontal and vertical equations must be true and each number must be used exactly once.

Puzzle Image

[Ref: ZZVV] © Erich Friedman
Erich Friedman's Website

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Difficulty: MediumPuzzle 4

Puzzle IconAt the local sweet shop, three particularly nice sweets are on special offer.

A Sparkle, a Wibbler and a Nobbler together cost 40p.

  • A Nobbler is over three times the price of a Sparkle.
  • Six Sparkles are worth more than a Wibbler.
  • A Nobbler, plus two Sparkles costs less than a Wibbler.
Can you determine the price of each type of sweet?

[Ref: ZQVP] © Kevin Stone

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