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Q: How do you know a number is divisible by 9?

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A number is divisible by 9 of its digits add up to a multiple of 9.

If the digits of a number add up to a multiple of 9, the whole number is divisible by 9.

yes, you know that because if you add the digits together and that number is divisible by 9, then that large number is divisible by 9. 3+4+2 is 9, which is divisible by 9. conclusion 342 is divisible by 9.

Every number is divisible by 9 but the answer wont necessarily be a whole number.

Add the digits and see if they equal a number divisible by nine.Example: 99 is divisible by 9 because 9 + 9 = 18 (18 is divisible by 9)

It is divisible by 9.

If a number is not divisible by 3 then it is not divisible by 9.

Yes, every number that's divisible by 9 is divisible by 3

Yes, any number divisible by 9 is also divisible by 3.

No - any number divisible by 9 will have the sum of its digits divisible by 9.

If the sum of all the digits is divisible by 9, then the entire number is divisible by 9! For example: 9,728,127 is divisible by 9. 9+7+2+8+1+2+7=36, and I know 36 is divisible by 9. Therefore, the whole number is. 982 is not. 9+2+8=19. 19 is not divisible by 9.Works for really huge numbers too. 3,456,245,190,769,984,245,865,992,831 The sum of the digits is 144. Unsure if that works? Find the sum of THOSE digits (and keep doing that until you get something that you KNOW is divisible by 9). 1+4+4=9. That means the whole huge number is divisible by 9!

9 is divisible by 1, 3 and 9.

It's very easy to test a number to see if it is divisible by 4 or by 9. If it passes both tests, then it is divisible by 4x9=36.To test for divisibility by 9, add the digits of the number. If the sum is divisible by 9, then the number is divisible by 9.To test for divisibility by 4, look at the last two digits. If they are a multiple of 4, then the number is divisible by 4.

The easiest way to know if a number is divisible by 9 is to add the digits in the number. 4 + 7 + 8 + 8 = 27 Since 9 will go into 27 evenly, 4788 is divisible by 9.

None, because 9 is divisible by 3.

Yes, but not evenly. The answer is 27 4/9 or 27.44444444444. An easy way to know if the number is evenly divisible by 9 is to sum the digits - if the sum is divisible by 9, so is your number. In this case 2 + 4 + 7 = 13 which is not divisible by 9.

663 is divisible by i dont know . but i do know that it can not be a even number so it has to be divisible by a odd number

add all the digits of the number and check if it is divisible by 3. eg-3321=3+3+2+1=9=divisible by three.the same works for 9.

999 is divisible by 9, but not by six; the next lower number divisible by 9 is 990, which is also divisible by 6, so that's the answer. Some shortcuts for divisibility: 0 is divisible by any number. If the last digit of a number is divisible by 2, the number itself is divisible by 2. If the sum of the digits of a number is divisible by 3, the number itself is divisible by 3. If the last TWO digits of a number are divisible by 4, the number itself is divisible by 4. If the last digit of a number is divisible by 5, the number itself is divisible by 5. If a number is divisible by both 2 and 3, it is divisible by 6. If the last THREE digits of a number are divisible by 8, the number itself is divisible by 8. If the sum of the digits of a number is divisible by 9, the number itself is divisible by 9. 990: 9+9+0=18, which is divisible by 9, so 990 is divisible by 9. 18 is also divisible by 3, so 990 is divisible by 3, and since 990 ends in 0 it's also divisible by 2, meaning that it's divisible by 6 as well.

Add the digits of the number. If that total is divisible by nine, so is the original number. Example: 12,345,678 The digits total 36. 36 is divisible by 9. So is 12,345,678.

There is only one number in 3206 and that is 3206. And that, is not divisible by 9.

Well - it's an even number - so it is definitely divisible by 2. If you add the digits together, you get the number 9, so it will divide by 3,6 & 9.

A number is divisible by 9 if a whole number of 9s can go into it and leave no remainder.

Yes, to test for divisible by 9: add the digits together [2+3+4+0=9]. If the sum equals nine, or a number divisible by nine, then the original number is divisible by nine. Example: 4752; 4+7+5+2 = 18, which is divisible by 9. If you're not sure, 1+8=9. You can always keep adding the digits together, and eventually you'll be left with a single digit number. If the sum is equal to 9, then the original number is divisible by 9.

a number is divisible by 9 if the sum of the digits is divisible by 9.