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begamatt on 09/14/2010 08:10 PM wrote:
Thanks cricketsler for providing your critique. Let me encourage you to review and rate other videos as well- your input is what makes Watchknow a "wiki" site. If you haven't already given this video its star rating, please do so. Thanks.
cricketsler on 09/14/2010 07:38 PM wrote:
I certainly hope people will not use this particular video to help them learn multi-digit subtraction. First, the author doesn't say why the "2 becomes a 12", and then they go on to say they are going to borrow from "this entire 700". Well, that "700" isn't 700, it's actually 7.000, and to phrase it as 700 does not teach it in a conceptual way. Sure, you can learn the steps to subtracting here, but that's all you'll accomplish. There is no support of place value or real number sense.