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Mathematical Puzzles


Difficulty: EasyPuzzle 1

Puzzle IconYou have a very large number of generic plastic building blocks, each in the shape of a cube.

Think about how many cubes you would need in order to construct a giant cube with 16 small cubes along each edge?

If you were to then remove the outside layer, how many small cubes would you have removed?

[Ref: ZUVM] © Kevin Stone

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Difficulty: MediumPuzzle 2

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 3

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 4

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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