[MATHEDCC] Divisibility Rules -Reply

Barb Gentry (bgentry@PARKLAND.CC.IL.US)
Thu, 02 Oct 1997 09:25:04 -0600

A number is divisible by 7 IFF it satisfies the following:
Subtract twice the right hand digit from the positive number represented
by the remaining digits. If this difference is divisible by 7, then the original
number is divisible by 7. Seems to me that it would be easier to use my
calculator and divide by 7 to test for divisibility by 7. ;>)
Barb

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