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If you add up all the digits in a number and the sum is a multiple of 9 then the original number is also a multiple of 9. For example; 12,167,314,839,018

1+2+1+6+7+3+1+4+8+3+9+0+1+8 = 54 = 6 x 9 therefore the original number is a multiple of 9, actually 1,351,923,871,002 x 9


Use a calculator and try to divide the number by 9. If 9 divides into the number a whole number of times then the number is a multiple of 9.

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Q: How do you know if a number is a multiple of 9?
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How do you now if a number is a multiple of 9?

You know that it is a multiple of 9 if it divides into 9 equally.


How do you know if a number is a factor of 9?

I think you might mean "multiple." If the sum of a number's digits is a multiple of 9, the original number is as well. If you want to know how you know if a number is a factor of 9, memorize the numbers 1, 3 and 9.


How do you know What is divisible by 9?

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


What is the difference a multiple of a number and a factor of a number?

A factor is what goes into a number, a multiple is what a number goes into. 3 is a factor of 9 27 is a multiple of 9.


What are facts about dividing by nine?

If the sum of the digits of a number is a multiple of 9, the number is a multiple of 9.


Which number is a multiple of 9 and 3?

Lowest common multiple of 9 and 3 is 9.


What is an even number and a multiple of 5 and a square number and a multiple of 9?

900


Which number below is a muiltiple of 9?

which number below is a multiple of 9


What number is 9 a multiple of?

9 is a multiple of 3. It is 3 x 3.


Is 92 a multiple of 3?

No, 92 is not a multiple of 3. A quick way to check if a number is a multiple of 3 is: add up the digits of the number you are checking; if this sum equals 3 or a multiple of 3, then the number is a multiple of 3. So in this case, 92 --> 9+2=11, which is not a multiple of 3. If you have to you can add again, so for 11 --> 1+1=2, which is not a multiple of 3. You can always repetitively add until you get to a single digit answer: if it's 3,6 or 9 then it's a multiple of 3. Also if your sum is 9 or a multiple of 9, then the original number is a multiple of 9. To check for 6, if a number is a multiple of 3, and also a multiple of 2 (an even number), then the number is a multiple of 6.


What multiple of 9 and is also a factor of 9?

Oh, what a happy little question! The multiple of 9 that is also a factor of 9 is 1. You see, a factor is a number that divides evenly into another number, and in this case, 1 can divide 9 without any remainder, making it a factor. Just like painting, math can be a beautiful and calming experience when we take our time to understand it.


What is the common multiple number of 9 and 21?

A common multiple of 9 and 21 is a number of the form 63*k where k is an integer.