Bedges/Sandbox – User

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[category:sandbox] Private Experiment #1


Method:

  • take any 4-digit number
  • rearrange those 4 digits
  • subtract the smaller number from the larger number
  • add the resulting 4 digits together
  • the result will be 9


Proof:

8419 - 4918 = 3501
3 + 5 + 0 + 1 = 9
7654 - 5746 = 1908
1 + 9 + 0 + 8 = 18
1 + 8 = 9