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Q: Example of divisibility rule for 21?

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

There is no easy rule for divisibility by 34.

why does the divisibility rule work for 4

By tautology. If it did not work, it would not be a divisibility rule!

there is a divisibility for 24 the rule is you can divide 24 as 6 and 4 i think

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

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What is the divisblity rule by 8

Divisibility is a noun meaning being capable of being divided. Example sentences: "The rule for divisibility by 5 is that the number ends in 0 or 5." "The easy divisibility of the cookies prevented fights among the children." "The divisibility of this pie is questionable, at best."

The divisibility rule for 2 works because the base of our number system, 10, is divisible by 2.

Rule: If it is divisible by 2 and by 3Numbers are divisible by 6 if they are divisible by 3 and 2. Therefore, for example, since 18 is divisible by 3 and 2, it is also divisible by 6.The divisibility rule for 6 is, it can go into the number if 2 and 3 can also.

There is no rule for 7 :P

Judging by some of the questions asked on this site, the first rule is that divisibility is a concept that applies only to whole numbers.

2 squared 1 = 4 so the divisibility rule is that it is divisible by 1, 2 and 4.

21

A divisibility rule is a statement of procedures to determine divisibility. For example:"A number is divisible by 2 if it ends with 0, 2, 4, 6 or 8".It does not make any sense to divide such a sentence by 2 or 895 or any other number!

By using the divisibility rule for 3, we find that 117 is divisible by 3. That makes it composite.

Able to Be Divided

2.50

There is no divisibility rule for 13 because it is a prime number. If you are thinking: why is there a divsibility rule for 2 and 3 then. Well, i don't know so go look it up on google.

The rule for 1 and the rule for 3.

the number is even.

It has to end 00.

it is divisible by5