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Maths Puzzles


Difficulty: Medium

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Puzzle 1

What value of * makes the following correct:

Puzzle Image

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[Ref: ZWPF] © Kevin Stone 



Difficulty: Easy

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Puzzle 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?

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[Ref: ZNGR] © Kevin Stone 



Difficulty: Medium

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Puzzle 3

CalculatorWhat 5 digit number am I thinking of.

  • It has two prime digits.
  • Digit 3 is the highest digit.
  • Digit 2 is lowest digit.
  • Digit 1 is higher than the sum of digits 4 and 5.
  • Digit 5 is half of digit 4.
  • Digit 1 is one smaller than digit 3.
  • Digit 5 is between digit 2 and digit 1
  • There are no duplicates and the digit 0 doesn't appear.
Don't forget that 1 isn't prime.

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[Ref: ZVHE] © Kevin Stone 



Difficulty: Easy

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Puzzle 4

CalculatorDaft Dave, our local DIY expert, is renovating the local hospital.

He has to number each of the rooms in the hospital with plastic numbers.

However, he has run out of the number 9.

How many 9's must Dave buy in order to number all 1,000 rooms?

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[Ref: ZRQK] © Kevin Stone 



Difficulty: Easy

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Puzzle 5

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.

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


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