Names:Jake Hughes,Michael Smith,Cameron Hodgkins Carter and Adam Stokes.

Ages:10 .

School: Woodlands Primary School.

Solution.

Our solution is to start off by thinking of whole number multiples and then you could start halfing the whole number multiple, but if you want to challenge yourself you could try to quater or three quater it. Be careful and check there are only four in that multiple.DON'T FORGET NOT TO HALF THE MULTIPLES OF 2!!!

(E.G) Multiples of five:5,10,15 and 25.
          Multiples of 2.5: 5,10,15 and 25.
          Multiples of 1.25: 5,10,15 and 25.
          Square numbers: 4,9,25 and 49. (2,3,5,7.)
          Prime numbers: 2,3,5 and 7.
          Multiples of 3: 3,9,15 and 21.
          Multiples of 1.5: 3,9,15 and 21.
          Multiples of 0.75: 3,9,15 and 21.
          Multiples of 2: 2,4,10 and 28.
          Multiples of 7:7,21,28 and 49.
          Multiples of 3.5: 7,21,28,49.
          Multiples of 1.75: 7,21,28 and 49.
          Multiples of 0.35: 7,21,28 and 49.
          Multiples of 0.825: 7,21,28 and 49. 
          Multiples of 0.625: 5,10,15 and 25.
          Multiples of 0.7: 7,21,28 and 49.
          Multiples of 0.3: 3,9,15 and 21.
          Multiples of 0.375:3,9,15 and21.
          Multiples of 0.15: 3,9,15 and 21.
          Multiples of 0.375: 3,9,15 and 21.
          Multiples of 0.675: 5,10,15 and 25.
          Multiples of 3.25: 5,10,15 and 25.
          Multiples of 1.05: 7,21,28 and 49.
          Multiples of 0.45: 3,9,15 and 21.

We hope this helped,if not don't give up.