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[Japo]

I'll go for a good old digital calculator every time, but

[_r.u.s.s.]

man, i remember that vid. it's impressive in a "wtf" sense but i'm pretty sure that doing

 21 x
 13
----
 63+
210
----
273

is like milion times faster

[Ohne Mitleid]

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

 21 x
 13
----
 63+
210
----
273

is like milion times faster

It's like a paper abacus. I agree with r.u.s.s.! Wtf was the first thing that sped through my mind. Ok, and there it goes again... Wtf!?

[Japo]

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

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.