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/sci/ - Science & Math

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14658615 No.14658615 [Reply] [Original]

>have been studying math for the past month
>was able to get up to a 5th grade level
>take a two day rest off doing math
>realize i have to relearn the times tables and go back a few grade level
is this normal?

>> No.14658636

dude i still remember it from kumon

>> No.14658644

I don't remember how to do shit after some rule or model, or formula made by literally who in the 1800s. I am in my 2nd year of an EE degree and don't remember shit from high school even, maybe rule for differential equations and integrals. Do kids in school actually memorize how to do math?

Just think logically and the answer will be obvious.

>> No.14658656

>>14658644
>Just think logically and the answer will be obvious.
>1047 x 47
yeah i dont know man it doesn't seem obvious to me

>> No.14658665

think smarter not hardr. look for newer methods to solve rather than be a coomer asian who studies 40 hours with no real techniques or iq.

>> No.14658674

>>14658656
Just split into more understandable cunks and do the simple calculations in your head. Of course you can't intuitively do calculations in your head on really obscure numbers, that is why we simplify problems and expressions before solving them

>> No.14658675

>>>14658656
Do you have a calculator?
Do you think all the top Math PhDs are doing all these calculations in their heads?

>> No.14658678

>>14658675
i imagine that they can on paper

>> No.14658685

>>14658678
You don't know how to multiply two digit numbers?

>> No.14658687

>>14658685
i am still learning but am getting close to grade 5 level

>> No.14658689

>>14658656
(40*7+7*7)+(40*40+7*40)+1000*47

I am pretty sure you can do all the calculations in your head with no calculator

>> No.14658693

>>14658689
that doesn't help me solve the original problem

>> No.14658695

>>14658693
Yes it does, just think logically, break things down, simplify difficult problems, that is literally what mathematics is about until like university level

You asked me to do a calculation on a very hard number which i cannot do, so i showed you how you can break it apart into several easy calculations which you can do.

>> No.14658702

>>14658687
Like the other anon said, just think logically and the answer will be obvious.
1047*47=1047*(40+7)=10470*4 + 1047*7, which is simple multiplication that you know
and love for 1 digit numbers
now tell me what 804*403=?

More broadly speaking, I think the issue is that you're just intimidated/nervous rather than actually struggling conceptually, I was the same.

>> No.14658708

>>14658695
but does just because your numbers make the same numbers the other problem make doesn't mean they are the same does it?
>>14658702
i fear no man and cannot experience fear

>> No.14658717

>>14658708
>i fear no man and cannot experience fear
so tell me what 804*403 is without cheating
>>14658708
>just because your numbers make the same numbers the other problem make doesn't mean they are the same does it
You can play around with the numbers anyway you want as long as they're still equal, for example 93*3 looks like a tedious calculation, but I could just rewrite it as (100-7)*3, which is equal to 300 - 21 after distributing, a much easier calculation.

>> No.14658733

>>14658717
>so tell me what 804*403 is without cheating
>804*403
>8x0x4 x 4x0x3
>0 x 0 + 8 + 4 + 4 + 3
>844300
am i right

>> No.14658734

>>14658636
Are u actually bragging about rote memorizing math?

>> No.14658736
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14658736

>>14658733
>am i right

>> No.14658755

>>14658736
lol did i actually get it right??

>> No.14658762

>>14658755
what are you using to study?

>> No.14658765

>>14658762
math?

>> No.14658766

>>14658765
yes, what book or program are you using?

>> No.14658772

>>14658766
a lot of different ones, i got a few different books and websites and yt channels

>> No.14658800

>>14658772
try khan academy from the start, and make sure to take seriously all the exercises.
cuz whatever you're doing right now isn't working

>> No.14658812

>>14658702
(800 + 4) * (400 + 3)

8 * 4 = 32
100 * 100 = 10.000

= 320.000
+
800 * 3 = 2400
+
4 * 400 = 1200
+
4*3 = 12

Answer is:
320.000 + 2400 + 1200 + 12
=326.012

Did I do it correctly? Phoneposting btw

>> No.14659054

>>14658656
A: times tables don't do that
B: i'll try to solve this by thinking logically

1047*47
1000*47 = 47000
40*47 = 1600[4*4*10*10] + 280[40*7] = 1880
7*47 = 280[7*40] + 49[7*7] = 329
47000 + 1880 + 329 = 48880 + 329 = 49209[digit by digit, right-to-left]

>> No.14659066

>>14659054
>4*4*10*10
i mean 40*40

>> No.14659072

>>14658736
kek

>> No.14659088

>>14658755
not even close

when breaking the multiplying down, you should be thinking of how many "xs" are in "y".
for instance, 564*290, I can take 564 out of the multiplication, and add it on after so it equals the same. like this:
564*289 + 564

that's the tool that lets us do one digit at a time. if you're doing this, you'll never be multiplying anything by 0.

In the example I gave, it'd be
564*290 = 4*290 + 60*290 + 500*290
and then you can continue to simplify from there.

>> No.14659129

>>14659088
>that's the tool that lets us do one digit at a time. if you're doing this, you'll never be multiplying anything by 0.
>In the example I gave, it'd be
>564*290 = 4*290 + 60*290 + 500*290
Not him but I'm gonna pretend I would get it from this

>> No.14659453

At the start of this thread i was breaking balls with you OP, now you're beginning to worry me