[Edu-sig] Edu-sig Digest, Vol 62, Issue 15

[kirby urner]

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 at 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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