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add all digits in a number together over and over until you can't anymore and if that's divisible by three the whole number is divisible by three.

eg: is 324 divisible by three? let's find out. 3+2+4=? 3

2

+4

___

9

and since 9 is divisible by three so is 324.

same rule applies with 9.

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โˆ™ 2011-03-13 19:03:57
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Q: How do you know when a number is divisible by 3 and 9?
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Related questions

What is the converse of the sentence A number divisible by 9 is also divisible by 3?

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


How can you know a number is divisible by 3?

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.


Can a number be divisible by 9 and 3?

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


Is every number that is divisible by 9 divisible by 3?

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


How do you know if a number is divisible by 2 and 3?

If a number is even, it's divisible by two. If the digits of a number add up to a multiple of 3, it's a multiple of 3. For example, 342 is divisible by 3 because 3 + 4 + 2 = 9 and 9 is divisible by 3.


What number is divisible by 9 but not divisible by 3?

None, because 9 is divisible by 3.


Is 342 disvisibel 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.


9 is divisible by what number?

9 is divisible by 1, 3 and 9.


Is 32643 divisible by both 3 and 9?

To check for divisibility by 9 sum the digits of the number and if this sum is divisible by 9 then so is the original number. For 32643: 3 + 2 + 6 + 4 + 3 = 18 which is divisible by 9 so 32643 is divisible by 9. As 9 = 3 × 3, any number divisible by 9 is also divisible by 3, thus as 32643 is divisible by 9 it is also divisible by 3. However, for completeness: to check for divisibility by 3 sum the digits of the number and if this sum is divisible by 3 then so is the original number. For 32643: 3 + 2 + 6 + 4 + 3 = 18 which is divisible by 3 so 32643 is divisible by 3.


How do you tell if a number is divisible by 3?

If the sum of the digits can be divided by 3. 93 is divisible by 3 because 9+3=12 we know 12 is divisible by 3 because 1+2=3 so the number is divisible by 3.


How do you know a number is divisible by 9 if?

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


What is a number in between 500 and 1000 that is divisible of 3 and 9?

There are many numbers between 500 and 1000 divisible by 3 and 9. Any number divisible by 9 is divisible by 3. How about 900?

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