I like the magical number 9
“What I want to know is why, no matter what number you use, if you [add its digits together, subtract this from the original number, and then repeatedly sum the digits of the resulting numbers], the answer is always 9? Take the number 3,568 for example:
- Add those digits together: 3 + 5 + 6 + 8 = 22
- Subtract 22 from your original number: 3,568 – 22 = 3,546
- Add those digits together: 3 + 5 + 4 + 6 = 18
- Add those digits together: 1 + 8 = 9
I come up with 9 no matter what I do