/sci/ - Science & Math » Thread #14068150

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Is doing simple maths in your head actually useful and good for your brain?

Anonymous Fri 07 Jan 05:05:42 2022 No.14068150 View Reply Original Report

Quoted By: >>14068359 >>14068360 >>14068959 >>14068999 >>14069016 >>14069370

Things like 653 x 18, for example...

Anonymous

Anonymous Fri 07 Jan 2022 06:10:55 No.14068286 Report

Quoted By: >>14068326 >>14069328 >>14069395

653x18 = 653x20 - 653x2
653x2 = (650x2) + 3x2 = 1306
653x18 =13060-1306 = 11754

Anonymous

Anonymous Fri 07 Jan 2022 06:32:32 No.14068326 Report

Quoted By:

>>14068286
just use Trachtenberg system

Anonymous

Anonymous Fri 07 Jan 2022 06:48:48 No.14068359 Report

Quoted By: >>14068360

>>14068150
engaging in pointlessness is always self destructive.
why are you here on this earth?

Anonymous

Anonymous Fri 07 Jan 2022 06:49:37 No.14068360 Report

Quoted By:

>>14068150
I guess it can help to build working memory
>>14068359
All of reality is pointless

Anonymous

Anonymous Fri 07 Jan 2022 12:15:38 No.14068926 Report

Quoted By:

bump

Anonymous

Anonymous Fri 07 Jan 2022 12:33:51 No.14068959 Report

Quoted By: >>14069344

>>14068150
I did it like 653*10*2=13060, and then 13060-1306=11756. Took about 20 seconds.

Anonymous

Anonymous Fri 07 Jan 2022 12:49:02 No.14068999 Report

Quoted By:

>>14068150
If you can apply it on the fly to a differential or dynamic system, without a doubt.

Anonymous

Anonymous Fri 07 Jan 2022 12:51:02 No.14069005 Report

Quoted By:

Knowing how to tie your shoelaces is useless. Your mom will do it for you.

Anonymous

Anonymous Fri 07 Jan 2022 12:54:41 No.14069016 Report

Quoted By:

>>14068150
It does save time being able to do it mentally.

Anonymous

Anonymous Fri 07 Jan 2022 13:15:00 No.14069060 Report

Quoted By: >>14069199

Doing simple maths is useful if it helps you to be successful.
Like for a poker player in a tournament with a $6M first prize, having to decide whether
to call or raise a bet when holding Q9 on a QQ664 board. What is the probability that the
opponent has two sixes? You are allowed only limited time, and you may not consult any
outside sources.

Anonymous

Anonymous Fri 07 Jan 2022 14:10:16 No.14069199 Report

Quoted By: >>14069260

>>14069060
Is it 1/990?

Anonymous

Anonymous Fri 07 Jan 2022 14:31:55 No.14069260 Report

Quoted By: >>14069386

>>14069199
No, not quite, it is probably larger. You are thinking of some random player having been
dealt the two remaining sixes from the 45 remaining cards, in which case it is not 1/990.

The situation is actually more complicated in a realistic situation. Say that you know that there
are 8 players around the table, and 6 of them have folded their hands before the flop. You
know that players who hold a 6 in their hand are more likely to fold than a player with high cards.
Then you have to factor in the probability that one of the 12 folded cards among the 45 is a 6,
in which case you are safe to raise your bet.
You are still not allowed to use a calculator.

Anonymous

Anonymous Fri 07 Jan 2022 14:57:19 No.14069328 Report

Quoted By:

>>14068286
exactly this. this is how you exercise memory and operations and shit

Anonymous

Anonymous Fri 07 Jan 2022 15:02:56 No.14069344 Report

Quoted By:

>>14068959
I gave up after 10 seconds and went "like, 11700?" I was pleased I was close enough. The other part of mental math is knowing how much precision you actually care about.

Anonymous

Anonymous Fri 07 Jan 2022 15:08:37 No.14069366 Report

Quoted By:

>mental math
You mean, arithmetics?

No.

Anonymous

Anonymous Fri 07 Jan 2022 15:10:14 No.14069370 Report

Quoted By:

>>14068150
>useful and good for your brain?
if you want to be a human calculator go ahead, but if you run into a problem that requires algorithmic thinking it will not help you in any way

Anonymous

Anonymous Fri 07 Jan 2022 15:15:30 No.14069386 Report

Quoted By: >>14069417

>>14069260
The random player holding two 6s is (2/45)(1/44) = 1/990, but I see what you mean about considering the history of the hand. There’s also the chance that your opponent is bluffing, right?
That’s actually pretty fucking cool anon, I’m considering learning how to play poker now. Any recommendations on learning how to play poker intelligently with probabilities in mind? Most of the poker players I know just go by gut feelings.

Anonymous

Anonymous Fri 07 Jan 2022 15:19:25 No.14069395 Report

Quoted By:

>>14068286
There's an easier solution than that
653*18=653*(20-2)=653*2*(10-1)=653*2*9
653*2*9=1306*9=11754

Anonymous

Anonymous Fri 07 Jan 2022 15:27:55 No.14069417 Report

Quoted By:

>>14069386
Right you are, I concede that the simplest solution is 1/990, I had a brainfart.
Intelligent poker sites on youtube:
https://www.youtube.com/c/PokerCoaching
https://www.youtube.com/c/CrushlivePoker
https://www.youtube.com/c/SolveForWhy
https://www.youtube.com/c/HandoftheWeek

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