Quote:
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Originally Posted by high_way
did you know : that no matter how big the number is, that if it is a multiple of 9 that you can add the numbers together until they become 1 number and that number will always be 9 (wow isnt that confusing).
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Forgiving all the replies to the original post...
I was taught this rule with the number 3. After all, 9 is a multiple of 3 and furthermore, 3 is a prime number. Try it yourself.
eg: 17904
1+7+9+0+4=21
2+1=3
Edit:
It turns out I might be wrong on this one. I'd delete it if I could.