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Mathematical Puzzles


Difficulty: EasyPuzzle 1

Puzzle IconAfter a day picking strawberries I had a basket full.

I ate 5 and gave Alex half of the remaining.

I then ate another 3 and gave Blake one third of the remaining.

I ate another 6 and then gave Charlie two thirds of the remaining.

I now had 34 strawberries left. How many did I start with?

[Ref: ZXGG] © Kevin Stone

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Difficulty: EasyPuzzle 2

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 3

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 4

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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