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Q: Who discovered the divisibility rule for three?

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

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

There is no easy rule for divisibility by 34.

why does the divisibility rule work for 4

The number formed by the last three digits have to be divisible by 8.

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

If the sum of the digits is divisible by 3, the number is also.

What is the divisblity rule by 8

123456789

If a number is divisible by both three and four, it's divisible by twelve.

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

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.

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.

They were discovered, not invented.

A number is divisible by 8 if and only if it is an integer and the last three digits make a number that is divisible by 8. A general divisibility rule for 2^n where n is an integer is to take the last n digits and if they make a number that is divisible by n then it is divisible by n.

the number is even.

It has to end 00.

It is 86