Poll: the sum(7,9)

[Dar Scott]

On Mar 14, 2005, at 11:09 PM, Mark Swindell wrote:

> To clarify:  7 and 9 were arbitrary numbers.  It could have been any 
> two single digit addends.  I didn't mean to focus on the manipulating 
> the 9 factor.  3 and 5, 6 and 8, what process do you use to instantly 
> know, or are there calculations involved?
-- 

Maybe I sorta rewrite like this:

7+9

9+7

XXXXX XXXX.  + XXXXX XX
           ^           v
           -------------

XXXXX XXXXX
XXXXX X

16

***********************

3+5
5+3
XXXXX XXX
8


************************

2xxxxx1        6xxx
x                  x
3xxxx      x        x
      x    xxx   7xx
       4    x        x
      x             x
5xxx           8xxx

8

***********************

6+8

XXXXX X.... + XXXXX XXX (aka double XXXX)
          ^                            v
          ------------------------------

XXXXX XXXXX
XXXX

14

These are based on habits learned when I was 4, perhaps.

It reminds me of chemistry.

Dar


**********************************************
     DSC (Dar Scott Consulting & Dar's Lab)
     http://www.swcp.com/dsc/
     Programming Services and Software
**********************************************