What a fascinating question! I had to think for a minute to try and analyze how I do that sort of mental arithmetic, but in the end I realized what I do.
I seem to have a visual stack that goes up to 10, so I put the 9 into stack, then move 1 from the 7 to fill the stack, leaving me with 10 in the stack and 6 left over. I guess this is #1 but with more of a number-line visualization rather than fingers :-)
HTH, Sarah
Sarah,
I am also digitally oriented. I envy those people with memories which allow them to simply snatch these results from their memory bank. Mine is bankrupt.
I also apply a similar digital technique on subtraction. For example: subtract 9 from 17. Subtract 7 from 9 to get 2; that's easy. Then subtract 2 from 10 to get 8. Therefore 9 from 17 = 8. Pathetic I know. I have even forgotten portions of the mutilation table. My transition into senility is very smooth.
(Do this with your fingers in you lap and you have a laptop computer.)
Jim _______________________________________________ use-revolution mailing list [email protected] http://lists.runrev.com/mailman/listinfo/use-revolution
