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Earn +20 ptsQ: Is 729 divisible by 9
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How could you adapt the rule for division by 3 to decide easily when a number is divisible by 9?
Just add up the digits and if that sum is divisible by 9 then the original number is divisible by 9. Example 729 = 7+2+9 = 18 (18 is divisible by 9 therefore 729 is divisible by 9) 123456789 = 1+2+3+4+5+6+7+8+9 = 45 (45 is divisible by 9 therefore 123456789 is divisible by 9)
Is 729 divisible by3?
Since the sum, 18, of the digits of 729 is divisible by 3, 18 = 3 x 6, then 729 is divisible by 3.
Is 729 divisible by 2?
No.
Cube of 9?
It is 9*9*9 = 729
What is 6561 divided by 9?
729
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