Best Answer

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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Q: What is the divisibility rule for 42?

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Related questions

There is no easy rule for divisibility by 34.

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

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

why does the divisibility rule work for 4

1,2,3,6,7,14,21,42

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

What is the divisblity rule by 8

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 rule for 7 :P

Able to Be Divided

2.50

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

the number is even.

It has to end 00.

it is divisible by5

It is 86

The rule for 1 and the rule for 3.

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.

it is divisible by 3 and 9

3 - 31

Division by zero is undefined.

It is 3 6 9