How do I calculate this in my head?
60*0.6
That must be 24.
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I would see 60 as 6 ⋅ 10 and 0.6 as 6/10. It is then possible to shorten with 10 so that 6 ⋅ 6 remains. And the small one-time should be remembered to such an extent that 6 ⋅ 6 = 36 should no longer be a problem.
My head reckons
(Other heads may count differently)
Multiplication -> inverse comma shift
60 = 0,6 = 6*6
60•0,1 is the same as 60:10? That would be 6, which is 10% and to come to 60% six times. That would be 36.
That’s what I’d do.
I reckon it (60*6)/10 = 360/10 = 36
the 60 by 10
the 0.6 times 10
6 x 6 = 36
60×6