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Mathematical Puzzles


Difficulty: MediumPuzzle 53

Puzzle IconWhat 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.

[Ref: ZVHE] © Kevin Stone

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Difficulty: EasyPuzzle 54

Puzzle IconDaft 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?

[Ref: ZRQK] © Kevin Stone

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Difficulty: EasyPuzzle 55

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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Difficulty: EasyPuzzle 56

Puzzle IconTwo 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 furthest?

[Ref: ZIMH] © Kevin Stone

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