How is this possible \[\frac{1}{4}-\frac{3}{8} = \frac{1}{2}\]

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How is this possible \[\frac{1}{4}-\frac{3}{8} = \frac{1}{2}\]

Mathematics
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It's not :o
help me
just found an awesome reasoning for how that is possible from one of our users xD
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Haha, that's great :))
rofl xD
wow youre a patient helper ganeshie ;)
\[\frac14-\frac38\\ =^? \frac{1-3}{4-8}\\ = \frac24\\ =\frac12\\ \]
Haha was just thrilled by how that user came up with such cute reasoning!
These kids on here are really smart, they just need the right push :P
|dw:1433833984854:dw|
Sorcery!
thats my fav one! wrong reasoning, right answer they are called happy fractions or something...
https://www.youtube.com/watch?v=Yajonhixy4g
And http://mathoverflow.net/questions/94742/examples-of-interesting-false-proofs
interesting, im still a bit clueless about identifying the flaw in that proof(youtube link) showing all triangles are equilateral ...
Haha, nice solution. How do you solve this though?
I got -1/8 on this T_T!
Wolfram says the answer is \(-1/8\). How did it get to that figure?
Without wolfram math i wouldn't be smart about math lol
lcd yo!
What...?
\[\frac{2}{2} \times \frac{1}{4} - \frac{3}{8} \rightarrow \frac{2}{8} - \frac{3}{8} \rightarrow = -\frac{1}{8}\]
find the least common denominator on this... the sign was missing when I saw that reasoning
Oh wow! Interesting method. Nice.
actually that's common x.x anyone out there can use least common denominator
No I can't.
and by the way a - sign was dropped in that image....when clobber did the arithmetic 2-3 = -1 for the numerator
but he drew a 1 instead of a -1
I just believed that these problems were supposed to be solved by Wolfram because they're hard, so I always plugged these numbers into Wolfram. Didn't know people could actually solve these.
Well you can it just takes a while longer to solve the problem but all that matters that getting it solved. Because not every problem is going to be easy as 2 + 2
what the...*bangs head*
Anyway, thank you for sharing this method! More people should know about it. I'm about to finish high-school and my classmates also use Wolfram for solving fractions.
lol honestly i never found a satisfying explanation for why common denominator is needed when adding/subing fractions
O__________________________O! Okay, that's fine for checking answers, but students shouldn't be dependent on it. My university doesn't allow calculators or computers. Have fun with that
I don't think any mathematics department does ;)
wolfram shouldn't be abused... and sometimes even Mr.Wolfy himself makes mistakes
Yea it cant solve every problem.
there was a professor who allowed everything ... book, calculator...tablet...but he retired recently
Haha, ganeshie, it should make sense though. You can add 1/8th and 4/8th of a cake like that, but you can't add 1/8th and half of a cake.
I will have to revise my fractions after finishing calculus.
oh lol @UnkleRhaukus you just broke a math rule with your example.
Oh I thought you were joking the whole time parth
;)
all triangles are equilateral
You hoped I was joking the whole time. :P
I guess I stretched it way too far.
nope it is fine, the joke is obvious to everyone ;p
I knew it
http://puu.sh/i9pL3/b1f88e3e47.png
LOL
should msg it to one of his gfs lol
omg dan.
ikr @ganeshie8 ;)
Anyways check out those false proofs from that link, pretty cool :)
From comments: The mistake lies in the drawing. The lines are too sloppy and if you actually draw it out, you will see C* always lies on the other side of C (or B* on the other side of B), so subtracting C*C from AC does not make the conclusion valid anymore.
``` one of his gfs lol ``` Subtle, I like it.
last semester I accidentally typed "Dan I love you" instead of "Dan I need your help" because I was working on a matlab code. T_T! I had to type to two people on os that it wasn't spam and it was an accident.
http://puu.sh/i9ruW/6515fd86d6.png
Don't worry, Dan's a player. He just gets everyone to fall in love with him.
This was before I had glasses, so yeah...I couldn't see well with small text
Lol. and i wonder who else hes with xD
@Astrophysics Holy crap, hahaha.
I like it how this post has completely gone off topic
Sorry haha
To be fair, the topic isn't something eye-catching.
All good @Astrophysics :)
@ganeshie8 can you please give us another prob?
What is \[\huge 2^{2014}-2^{2013}?\]
ok
\[2^{2013}\]
crap it repeated my statment
Sorry, wrong answer. Should be\[\huge 2^{2013}\]
Or maybe you could do it "that" way:\[\large 2^{2014} - 2^{2013} = 2^{2014 - 2013} = 2^1 = 2\]
Yeah haha, \[\huge 2^{2013}(2) - 2^{2013} \implies 2^{2013}(2-1) = 2^{2013}\]
Next one
Geniuses...ok what number am I thinking of?
Your SmartScore.
96
http://puu.sh/ajiP2/15be9508bf.png
You're just cashing in on hartnn's efforts.
In hartnn's pic, his arms are all bulgy and muscular. Coincidence? I think not.
You should read the classic MathEd paper about Benny.
\(\color{blue}{\text{Originally Posted by}}\) ganeshie8 How is this possible \[\frac{1}{4}-\frac{3}{8} = \frac{1}{2}\] \(\color{blue}{\text{End of Quote}}\) It's isn't? What's so amazing about it anyway? All I see is user just happen to think that subtraction works like multiplication, hence did\(\frac{1}{4}-\frac{3}{8} = \frac{1-3}{4-8}\)
^ which broke a math rule...

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