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Maths Puzzles


Difficulty: EasyPuzzle 1

Puzzle IconWhat is the 5-digit number in which:

the sum of the first two digits is one smaller than the third digit
the third digit is double the fourth digit
the fourth digit is double the last digit
the third digit is the product of the fourth and fifth digits
the second digit is five more than the first digit
the first digit is one-eighth the third digit and also one-fourth of the fourth digit?

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[Ref: ZBUX]  


Difficulty: MediumPuzzle 2

Here is a curious grid, the sums of the shapes are shown at the end the row and at the base of each column.

What is the missing sum? What are the different shapes worth?

Puzzle Grid

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[Ref: ZJFC] © Kevin Stone 


Difficulty: MediumPuzzle 3

Puzzle IconWhat is the sum of...

...all of the numbers from 1 to 1000?

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[Ref: ZONR]  


Difficulty: EasyPuzzle 4

Which of these is correct:

Six and six IS eleven or six and six ARE eleven?

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[Ref: ZYTW]  

Next Puzzles

 



 

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[Added September 1997]

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