User:Bedges/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