Hi John -- I like that your 2nd example doesn't go strictly left to right *or* right to left -- columns resolve (by carrying) in various orders, always to the same end. I could see boosting the frame rate at showing many more examples really quickly -- another meaning of "mental arithmetic". 2nd roots anyone? Kirby On Mon, Sep 15, 2008 at 4:19 PM, John Posner <jjposner@snet.net> wrote:
... Presumably we could apply the same approach to teaching elementary-school arithmetic algorithms, maze traversal algorithms, and the like for One Laptop Per Child. I have suggested this to their Education mailing list.
Here's a video of a tool I wrote to help elementary-school kids learn carrying/borrowing in the addition/subtraction of whole numbers.
http://showmedo.com/videos/video?name=2010000&fromSeriesID=201
To get this tool, and a similar one for adding/subtracting fractions, go to:
http://www.geocities.com/jjphoogrp
-John Posner
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