Quote:
Originally Posted by _r.u.s.s.
man, i remember that vid. it's impressive in a "wtf" sense but i'm pretty sure that doing ... is like milion times faster
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Well with two-digit figures, sure. But the method in the video seems to be faster as the number of digits goes up.
But as I said, digital calculators FTW, of course that doesn't mean you shouldn't learn to calculate mentally, to a point, but training to beat a calculator, even if possible, is pointless. Cultivating mental skills in one thing, trying to deny progress that's decades old is another.