http://unlearningmath.com/2010/01/07/groupings-shopping-lists-vectors-part-14/ math as a garden, friendly and always new Wed, 29 Feb 2012 04:07:56 +0000 hourly 1 http://wordpress.com/ http://unlearningmath.com/2010/01/07/groupings-shopping-lists-vectors-part-14/#comment-456 Sun, 12 Sep 2010 04:30:52 +0000 http://unlearningmath.com/?p=1456#comment-456 [...] Groupings, Shopping Lists, and Vectors – part 14 – how does this treatment compare with textbook treatments? [...]

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