Divide the number by 50; add the quotient and remainder. The original
number is divisible by 7 if the sum of quotient and remainder is divisible
by 7.
Example: 476 divided by 7 has quotient 9 and remainder 26; the sum of
these is 35 ; therefore 476 is divisible by 7.
Not as simple a rule as for 5's or 8's or some others.
At 08:50 AM 10/2/97 EST5EDT4,M4.1., Phil Mahler wrote:
>One of our staff in a math lab recently created a summary of
>divisibility rules for dividing by the whole numbers 2,3,...,10.
>
>example: A number is divisible by 2 if its ones digit is 0,2,4,6,8.
>
>It states there is no rule for 7.
>-----------------------------------------------------------------
>Assuming the domain of discussion to be the whole numbers, is this true?
>
>Phil Mahler
>Middlesex CC
>Bedford, MA
>
>p.s. There is some ambiguity in the question, which I chose to not remove.
>****************************************************************************
>* To post to the list: email mathedcc@archives.math.utk.edu *
>* To unsubscribe, send mail to: majordomo@archives.math.utk.edu *
>* In the mail message, enter ONLY the words: unsubscribe mathedcc *
>* Words in the Subject: line are NOT processed! *
>* Archives at http://archives.math.utk.edu/hypermail/mathedcc/ *
>****************************************************************************
>
>
David Etzwiler
UWC-Baraboo
detzwile@mail.uwc.edu
****************************************************************************
* To post to the list: email mathedcc@archives.math.utk.edu *
* To unsubscribe, send mail to: majordomo@archives.math.utk.edu *
* In the mail message, enter ONLY the words: unsubscribe mathedcc *
* Words in the Subject: line are NOT processed! *
* Archives at http://archives.math.utk.edu/hypermail/mathedcc/ *
****************************************************************************