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If you add up the digits, and the sum is divisible by 9 or a multiple of 9.
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For really big numbers you may need to find the digital root (sum of digits) of the digital root.
The divisibility rule for 9 is that the sum of the digits of a number must add up to 9 or a multiple of 9.
For example, is 81 divisible by 9? Lets find out! 8+1=9. Then it is divisible by 9.
What else can I help you with?
What is the divisibility rule of 18?
It is even and the sum of its digits is divisible by 9.
What is the divisibility rule for 63?
Its digits add up to 9 so therefore it is divisible by 9
Why does divisibility rule for 6 work?
By tautology. If it did not work, it would not be a divisibility rule!
What is divisibility rule?
What is the divisblity rule by 8
What is the divisibility rule for 34?
There is no easy rule for divisibility by 34.
What is the rule for divisibility of 3?
It is 3 6 9
Do multiples of 9 add up to 9?
Yes. It is the divisibility rule for 9.
Divisibility rule for 9?
If the digit sum of a number adds up to 9 then it is divisible by 9.
What is the divisibility rule of 18?
It is even and the sum of its digits is divisible by 9.
What is the divisibility rule for 63?
Its digits add up to 9 so therefore it is divisible by 9
What divisibility rule can go into 36?
9 because the digits of 36 add up to 9
Why does divisibility rule for 6 work?
By tautology. If it did not work, it would not be a divisibility rule!
What is the Divisibility rule of 1827?
Because the final digital sum is 9 then it is divisible by 9 as follows 1827/9 = 203
How can you check if a number is divisible by 9 when usiing the divisibility rule for 9?
If all the digits add up to 9 then it is divisable by 9
Why does divisibility rule for 9 work?
add all the digits together and see if it is divisible by nine.
What is divisibility rule?
What is the divisblity rule by 8
What is the divisibility rule for 34?
There is no easy rule for divisibility by 34.
