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/sci/ - Science & Math

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8832403 No.8832403 [Reply] [Original]

ITT we post the most efficient methods of basic mental mathematical calculation

>Addition
>Subtraction
>Multiplication
>Division

>> No.8832592

bump!

>> No.8832698
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8832698

practice

>> No.8832732
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8832732

>>8832403
>thinks he can just start new generals out of nowhere
>mental math general

>> No.8832842

>>8832403
https://en.wikipedia.org/wiki/Trachtenberg_system

>> No.8832852

You guys keep talking about mental arithmetics forever, but I haven't seen you mention system 1 (memory) and system 2 (thinking). There is no way you are good at arithmetics without thinking about what these do

>> No.8832887
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8832887

>>8832403
>arithmetic

Literally what's the purpose? This is why normies think math is fucking useless, because we make them memorize operations of arbitrary values rather than constructing a core understanding of these operations. This is why linear algebra and complex numbers seem like to overly esoteric, useless jargon to young people. Fuck you.

>> No.8833011

If you work a shit tier job where you count registers at the end of your shift, count your $5 bills as if they're $10, then divide by 2 at the end.