Let me see if I can remember:
Take the number 366198
Remove the last digit (8), and double it (16)
Subtract the 16 from the original number with the last digit removed:
36619-16 = 36603
Repeat the process
3660-6 = 3654
365-8 = 357
35-14 = 21
2-2 = 0
If you end with a 0, or a number divisible by 7 (such as 21, or 357) you
can stop!!
Good luck
Aloha Kate (Maui Community College)
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