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This is incorrect; it works with odd-length numbers, like the example, but not even-length, like most credit cards.
Reading the edits, it looks like it was originally written differently (from the rightmost digit, moving left...), but the confusion is in what is being described- creating a check digit for a number or validating a number with a check digit. The current description is creating a check digit for a number, so "from the rightmost digit, moving left..." is also incorrect, since the original number does not have the check digit. "From the rightmost digit, moving left..." is correct for validating a number with a check digit. <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/64.193.143.107|64.193.143.107]] ([[User talk:64.193.143.107|talk]]) 19:01, 17 April 2013 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
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