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
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