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?
Mark
On Mar 14, 2005, at 8:38 PM, Mark Swindell wrote:
It's this: How do you mentally process simple addition/subtraction
facts? What actually happens in your brain to elicit 16 when you hear
7+9? (for example)
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