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

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12y ago

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How would you test weather 7 is a factor of 29?

Since 4 x 7 is 28, you know that 7 isn't a factor of 29. Since 29 is a prime number, you know that 7 isn't a factor of it. To be perfectly sure, divide 7 into 29. If the answer is an integer, it's a factor.


How would you explain that 7 isn't a factor of 291 on a school paper?

You know that 7 isn't a factor of 291 because the quotient of 291 and 7 isn't a whole number.


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What number is both a factor and multiple of 7?

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What is the greatest common factor of 7 and 26?

Since the number 7 is a prime number and not a factor of 26, the greatest common positive integer factor of 7 and 26 is 1.


What is a prime number and is a factor of 7?

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If you know a factor of a number can you find another factor explain?

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What prime number is a factor of 91 but not a factor of 26?

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