http://www.flashcardexchange.com/tag/13's www.flashcardexchange.com: 13's Flashcards en-us Wed, 15 Feb 2012 12:35:59 PST Wed, 15 Feb 2012 12:35:59 PST support@flashcardexchange.com 720 http://www.flashcardexchange.com/flashcards/view/379674 Card set includes multiples of 13 from 13x1 up to 13x20; and, division by 13 from 260/13 down to 13/13. Also includes quick formula to determine when larger numbers are divisible by 13. 2006-09-14 http://www.flashcardexchange.com/flashcards/view/379674