/sci/ - Science & Math » Thread #14202327

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Anonymous Tue 08 Feb 19:03:44 2022 No.14202327 View Reply Original Report

Quoted By: >>14202431 >>14202437 >>14202929 >>14203638

WTF math is so easy now
https://www.youtube.com/watch?v=2jj0e5U89iw

Anonymous

Anonymous Tue 08 Feb 2022 19:23:53 No.14202403 Report

Quoted By: >>14202438

41*13 is trivial to do in your head

Anonymous

Anonymous Tue 08 Feb 2022 19:31:06 No.14202431 Report

Quoted By: >>14202826

>>14202327
So its the same method as normal multiplication but instead of figuring it out immidiately you end up counting dots. Retard

Anonymous

Anonymous Tue 08 Feb 2022 19:33:06 No.14202437 Report

Quoted By: >>14202454

>>14202327
425972135*1242476421 = x
The sum of x's digits will equal 2*6=9 which means the answer is divisible by 9.

Anonymous

Anonymous Tue 08 Feb 2022 19:34:52 No.14202438 Report

Quoted By: >>14203304 >>14204192

>>14202403
not for me ;_;

Anonymous

Anonymous Tue 08 Feb 2022 19:38:08 No.14202454 Report

Quoted By:

>>14202437
3 not 9. 12 = 1+2=3

Anonymous

Anonymous Tue 08 Feb 2022 20:11:13 No.14202626 Report

Quoted By: >>14204208

Now do 98089*999 by using this method

Anonymous

Anonymous Tue 08 Feb 2022 20:58:29 No.14202826 Report

Quoted By:

>>14202431
rude

Anonymous

Anonymous Tue 08 Feb 2022 21:21:43 No.14202929 Report

Quoted By:

>>14202327
Lines and intersections is a cool way of thinning about multiplication but it's totally to use practically.

Anonymous

Anonymous Tue 08 Feb 2022 22:56:04 No.14203304 Report

Quoted By: >>14205013

>>14202438
It's just 40*13+13 and 40 is just 2*2*10. Double 13 twice, multiply by 10, then add 13.

Anonymous

Anonymous Wed 09 Feb 2022 00:17:06 No.14203638 Report

Quoted By:

>>14202327
Just do 2x13x2x10+13 inside your head. Way faster.

You SHOULD be able to solve this.

Anonymous

Anonymous Wed 09 Feb 2022 02:56:28 No.14204192 Report

Quoted By:

>>14202438
>not for me

not even close to being true. i challenge you to fail at learning ho0w in an hour and mastering in a few days.

How to Calculate Quickly: Full Course in Speed Arithmetic
https://libgen.rs/book/index.php?md5=5EDF34EA955B3EEE23679A472B44A4AF

Anonymous

Anonymous Wed 09 Feb 2022 03:02:54 No.14204208 Report

Quoted By:

>>14202626
sum of digits will equal 9

Anonymous

Anonymous Wed 09 Feb 2022 07:41:54 No.14205013 Report

Quoted By:

>>14203304
Unnecessarily complicated. Just multiply by 10 and add 41*3.

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