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There are a few tricks with multiples of nine. One is only helpful up to nine times nine. Hold up all ten fingers and say it is 9 X 3 you put your third finger down (from the left) and you have 2 fingers on the left side (2) and 7 fingers on the right (7), so 9x3= 27.

The only more advanced tells whether large numbers are divisible by 9. All you do is add all the digits in a number and if the total is divisible by 9 than the number is.

IE; so in the number 35,001,747. you add all the nonzeros, 3+5+1+7+4+7=27 so its divisible by nine.

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Q: What is the 9 times trick?
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