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0: Every number is divisible by 0

1: Every number is divisible by 1

2: Every even number is divisible by 2

3: If the sum of the digits is divisible by 3, then so is the whole number. Repeat the process if necessary - example: is 4,962 divisible by 3? 4+9+6+2=21 2+1=3 - 3 is divisible by 3. Therefore, 4,962 is also divisible by 3

4: If the last 2 digits of a number are divisible by 4, then so is the whole number

5: A number is divisible by 5 if the number ends in 5 or 0

6: A number is divisible by 6 if it's divisible by both 2 and 3

7: If the last digit doubled subtracted from the number left is equal to a number divisible by 7, then so is the whole number. Repeat the process if necessary - example: is 2,541 divisible by 7? 2*2=4-254=252 2*2=4-25=21 1*2=2-2=0 - 0 is divisible by 7. Therefore, 2,541 is also divisible by 7

8: A number is divisible by 8 if the last 3 digits are divisible by 8

9: If the sum of the digits are divisible by 9, then so is the whole number. Repeat the process if necessary

10: A number is divisible by 10 if the last digit is a 0

11: A number is divisible by 11 if any other digit added together minus every digit left equals a number divisible by 11(not 1) - there is another rule that says that if the answer to the first number minus the second number plus the third number and so on equals a number divisible by 11, then so is the original number

12: A number is divisible by 12 if it is also divisible by 3 and 4

13: If the last digit multiplied by 4 plus the rest of the number is equal to a sum that is divisible by 13, then so is the original number

Q: What are the divisibility rules for 1-13?

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Related questions

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

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The answer will depend on the divisibility rules list.

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

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

12

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

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.

Jason Delaware

They were discovered, not invented.

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0.4557

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

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.

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.

Three

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.

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.

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

Yes.

If a number is even, then it is divisible by 2.

If a number is divisible by 3 and 5, it is divisible by 15.

bogo mo!

The number 0.

The divisibility rules will show that 53 is not divisible by anything other than 1 and itself. Since it is already prime, it doesn't have a factorization.