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Maths Puzzles


Difficulty: Medium

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Puzzle 1

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 2

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 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

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



Difficulty: Easy

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Puzzle 4

Old CarTwo friends were driving from their home to Manchester, Kevin drove the first 90 miles, and Daniel took over the remainder of the journey.

On the way back, Kevin drove to begin with, and Daniel took over for the last 100 miles.

Who drove the most?

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[Ref: ZIMH] © Kevin Stone 



Difficulty: Medium

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Puzzle 5

Exactly how many minutes is it before seven o'clock, if 40 minutes ago it was three times as many minutes past two o'clock?

Time

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[Ref: ZNNB] © Kevin Stone 


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