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2. How do you know if a number is
divisible by 9 without dividing?

2 Answers

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If the sum of all the digits of a number is divisible by 9, then the number is also divisible by 9. examining its digits.
User Phuoc
by
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1 vote

Answer:

Add all the digits of the number, then check if that sum is divisible by 9. If yes, we know the number is divisible by 9.

User Perreal
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