### John Cook

Discussion -You can tell how long the repeating decimal part of a fraction a/b will be before computing it. Factor out as many 2's and 5's as you can from b and call the result d. The repeating part of the decimal has length no more than d-1. See post for details.

You can tell what the decimal expansion of a fraction will look like, how long the repeating and non-repeating parts are, before calculating it.

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That's quite interesting.

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