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If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.

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12y ago

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How do you know when 7 is a factor of a number?

Double the last digit, subtract it from the rest. If the result is divisible by 7, the whole number is divisible by 7.


What number is not divisible 7?

23 is not divisible by 7.


If a natural number is divisible by 7 then it is divisible by 14?

No, 7 is a natural number divisible by 7 and not 14 for example. In fact every odd multiple of 7 (i.e. 7 times 1,3,5,7,...) is divisible by 7 and not 14.


What number is 663 divisible?

663 is divisible by i dont know . but i do know that it can not be a even number so it has to be divisible by a odd number


Example of divisibility rule for 21?

a number is divisible by 12 if the number is also divisible by both 3 and 7. You mean a number is divisible by 21 if it is divisible by 3 and 7.


Are all the odd number divisible by 7?

Every number is divisible by any non-zero number. No, there are an infinite number of odd integers which are not evenly divisible by 7..


What prime number is divisible by 7?

The number 7.


What is the largest two odd digit number divisible by 7?

98 is the largest two digit number divisible by 7.


What prime number can I divide with 7 and 8?

The only prime number divisible by 7 is 7. There are no prime numbers divisible by 8.


What is the smallest number that is divisible by 5 6 and 7?

The smallest number that is divisible by 5, 6, and 7 is 210.


What is the greatest three digit number that is divisible by 7?

The greatest three digit number that is divisible by 7 is 994.


Is 527 divisible by 3?

No.A very quick way to know whether or not a number is divisible by is adding up the numbers within the number. And see if the new number is divisible by 3.For instance, the number 527, add 5, 2, and 7 together. (5+2+7=14) The answer, 14, is not divisible by 3.Another example would be the number 168. 1+6+8=15 The number 15 is divisible by 3, therefore the number 168 is divisible by 3.