Date: Jan 18, 2013 11:47 PM
Author: Virgil
Subject: Re: Terminating Deciamal Expansion

In article <>,
"Charles Hottel" <> wrote:

> I would appreciate some hints on solving this problem:
> Show that any rational number p/q, for which the prime factorization of q
> consists entirely od 2s and 5s, has a terminating decimal expansion.
> Thanks.

If q = 2^m*5^n for non-negative integers m and n, let k = max(m,n)

then r = (p/q)*10^k is an integer, so and p/q = r/10^k.