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The divisibility rule for 42 is
- divisibility by 2, AND
- divisibility by 3, AND
- divisibility by 7.
Divisibility by 2 requires the number to be even. That means it must end in 0, 2, 4, 6 or 8.
Divisibility by 3 requires that the digital root of the number is divisible by 3. That is, the sum of the digits is divisible by 3. If the first sum is large, you can calculate the digital root of the digital root (and again, if necessary) and check that for divisibility by 3.
The divisibility rule for 7 is more difficult.
Take the last digit (units).
From the number formed by the remaining digit, subtract twice the last digit.
If the answer is divisible by 7 (including zero or negative numbers), then the original number is divisible by 7.
For large numbers, repeat the process to bring the number down to a manageable size.
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Why does divisibility rule for 6 work?
By tautology. If it did not work, it would not be a divisibility rule!
What is divisibility rule?
What is the divisblity rule by 8
What is the divisibility rule for 34?
There is no easy rule for divisibility by 34.
What is the divisibility rule?
Able to Be Divided
What is the divisibility rule for zero?
Division by zero is undefined.
Why does divisibility rule for 6 work?
By tautology. If it did not work, it would not be a divisibility rule!
What is divisibility rule?
What is the divisblity rule by 8
What is the divisibility rule for 34?
There is no easy rule for divisibility by 34.
Why does divisibility rule for 2?
The divisibility rule for 2 works because the base of our number system, 10, is divisible by 2.
What is the divisibility rule?
Able to Be Divided
What is the Divisibility rule of 5?
2.50
What is the 1st of rule divisibility?
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.
What is the divisibility rule for 2 squared 1?
2 squared 1 = 4 so the divisibility rule is that it is divisible by 1, 2 and 4.
What is divisibility rule for two?
the number is even.
What is the divisibility rule for 13?
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.
What is the divisibility rule for zero?
Division by zero is undefined.
What is the divisibility rule for 41677?
Just carry out the division.
