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Q: What are the divisibility rules for 9?

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The divisibility rules of 4 and 9 are combined to make the divisibility rule of 36.

3 and 9. And they divide into 123456789 whether or not you use divisibility rules!

Its digits add up to 9 and so therefore it is divisible by 9

Do the division, if there is no remainder, it is divisible. Seriously, many of the "divisibility rules" that have been discovered become more complicated than doing the actual division. For practical purposes, just learn the divisibility rules for a few simple cases (divisibility rules by 2, 4, 8, 5, 10, 3, 9, 7, 11, and 13), and for all other cases, just do the division.

If the last 3 digits are divisible by 8 and the sum of the digits are divisible by 9.

fractions help you write out divisibility rules because divisibility rules help with fractions . Glad I would help good bye

The answer will depend on the divisibility rules list.

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With the common divisibility rules, you can quickly see that it is divisible by 5, and by 9 (3 x 3). If you divide 225 by each of these numbers, you should be able to get the remaining factors quickly, as well.

The divisibility rules for a prime number is if it is ONLY divisible by 1, and itself.

1 3 9 19 57 95 171 285 855

12

the divisibility rule for 2 is: The number is even;the last digit ends with a 2,4,6,8,10, etc.The divisibility rule fir 3 is: The sum of the number is divisible by 3The divisibility rule for 4 is: The last two digits are divisible by 4The divisibility rule for 5 is: The number ends with a 5 or 0The divisibility rule for 6 is: The sum CAN be divisible by 2 and or 3The divisibility rule for 9 is: The sum of the number is divisible by 9The divisibility rule for 10 is : The number ends with a 0

You can always check on the divisibility of a number by dividing it into another number. But if you know the divisibility rules, you can get that information easier and faster.

use divisibility rules to find at least four factors of the number 19

i think divisibility rules help with fractions because it helps you reduce the fraction to make i a simple fraction.

171 is divisible by 9 because its digits add up to 9 i.e. 1+7+1 = 9 and so 171/9 =19

It isn't worthwhile to invent or memorize complicated divisibility rules for lots of numbers. Just carrying out the divisions is faster in most cases.

For any practical purpose, it is easier to simply divide, instead of looking for fancy divisibility rules. However, you can apply the divisibility rules for 3 and for 7. This works because (a) their product is 21, and (b) these numbers are relatively prime.

The sum of the individual digits must be a multiple of nine. For example, 711 would be 7+1+1 = 9, which is obviously a multiple of nine. 711 / 9 = 79

Jason Delaware

They were discovered, not invented.

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Divisibility rules help you find the factors of a number. Once you've found the factors for two or more numbers, you can find what they have in common. Take 231 and 321. If you know the divisibility rules, you know that they are both divisible by 3, so 3 is a common factor.