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/sci/ - Science & Math

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10449715 No.10449715 [Reply] [Original]

Hi /sci/ I humbly ask for your advice. I'm one of those people who used to say "durr I'm not good at math but who cares lol." I recently realized that was me justifying my laziness in school and that remaining willfully stupid is not how I want to live my life anymore.

So what I want to know now is: how can I git gud at math? I'd like to get the point where I can do large divisions and multiplications in my head. Earlier I saw 15 * .75 and seriously had to pull up a calculator even though that calculation should be able to instantaneously fire off in my mind.

Pic related is me.

>> No.10449831

khancademy. think of where you are then go one grade level back.

also aim for mastery of skills in math, just being able to solve a problem is not good enough, learn to recall the names of theorems and steps you took to get your answers. thats what math is, not just memorizing times tables

>> No.10449850

>>10449715
>how can i git gud at math?
>I'd like to get the point where I can do large divisions and multiplications in my head

That's not being good at math. That's trying to compete with a machine that can do the same thing but 1000 times faster.

>> No.10449857

>>10449850
EDIT: Sure, you should be able to multiply 15 * 3/4 = 45/4 = 11.25 mentally, but that doesn't mean you know math, and there's certainly no need to know how to multiply 53457.32 * 21.89, for example.

>> No.10449866

>>10449715
>the point where I can do large divisions and multiplications in my head
Arithmetic is not math.

>> No.10449881

>>10449715
(75*10)+(75*5 (I'd just add half of the first value)) then just move the decimal back as many figures as you moved it to get from 0.75 to 75. Then when you add parts start from the largest digit and move along. Unless you're a savant mental arithmetic is about breaking the problem into digestible chunks and put the parts back together. It takes practice, you can estimate quickly with this process, which is infinitely more valuable than trying to be a human calculator

>> No.10449885

You just get gud man
https://www.khanacademy.org/math

>> No.10450181

>>10449715
Firstly, calculus is hardly math, let alone divisions and multiplications.
Secondly, practice. Don't forget the "divide and conquer" principle.