40-32/2
=40-16
=24
=4*3*2*1
=4!
this post was submitted on 26 May 2024
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Ah shit. I almost hate this one more than loss.
I hate how these things always come up because "order of operations!" It's mostly people who are bad at math remembering one topic they struggled with and finally got right, and now they know it's a touchy subject so it will drive engagement. It's the modern equivalent of "Mathematicians hate this one secret for solving equations! Click to find out!" Pure engagement bait.
But in all the engineering ive done, things never really come up like this. If there is any potential clarity issues, parentheses would be used, or it would be formatted in a way that makes it much more clear.
40 - (32/2), or 40 - ³²⁄₂ has no clarity issues imo. You don't even have to think about order of operations because 32 halves is a number on its own. it isn't an "operation" to do necessarily, it's a fraction to reduce.
And yes, I get the joke. The joke is making fun of the engagement bait of "some people will get the order of operations wrong!"
The joke
(40 - 32)/2 = 4
If you stop here, you used the wrong order of operations. This is where the the fights normally start in the replies.
but the kid said "4!" not "4"
40 - (32/2) = 24 = 4 * 3 * 2 * 1 = 4!
s. If there is any potential clarity issues, parentheses would be used, or it would be formatted in a way that makes it much more clear.
It reminds me of a very old xkcd that posits "communicating badly and acting smug when you're misunderstood is not cleverness "
I knew XKCD is based, but this is new level
I mean, xkcd numbers its comics sequentially, and he's well into the 2000's now, so a 1xy comic is ancient. Looks like at times, old xkcd was brutal.
Especially hat guy.
Who's on first? :-)
It's the same as "only 2% of people get this right! If you get it right you have a very strong brain!". It's just a little more devious about it.
It does leave ambiguity with it being an, apparent, quote/dialogue. Correct and Incorrect are both correct depending on your POV and how you interpret social media posts
Love the insight on the bait.
Thanks for the mathsplanation too.
40-32/2 _ 4!
40-16 _ 2×3×4
30-6 _ 2×12
24 = 24
Checks out.
Depends if the kid said "four!" or "four factorial"
all maths must be said in a neutral tone lest you imply factorials
That’s how I say factorial though I just yell
So Italians mathematicians put everything in factorial
Almost as if the joke relies on the fact that in written form those are the same.
Throw up some brackets, you rage-baiting motherfucker!
No actually the trick to this one is that Four-Factorial equals 24
So 40 - 16 = 24
Aha! Fair enough.
This one's perfectly unambiguous without brackets, unlike the 1/2x stuff
Don't need brackets due to BODMAS Division comes before subtraction
Even your "BODMAS" isn't universal, lots of people learn "PEMDAS" or "BEDMAS"
At any level of mathematics after elementary school, you never see terrible expressions like this. Well, except for facebook and twitter
Take for example: 2/2*2 It is 0.5 or 2 depending on order. But if I were anything after high school (I was more complacent in high school, I guess) if someone gave me an arbitrarily solved equation or expression like this, I would be livid and raise hell at them for trying to do that.
The fundamentals are literally the same, and the difference is in the words people use for the same thing, brackets and parentheses are used in the same way and only changes how the acronym is spelled. Powers, indices and exponents are the same thing. Here's my version, PITDAT (parentheses, indices, times, divide, add, takeaway.)
Yes, the fundamentals the same, higher orders come first. BUT...
-Multiplication comes before division in some forms, like PEMDAS. In the example I use, this changes the answer.
-When you apply an operation, you should specify what it is operating on. In all of these acronyms, addition comes before subtraction, but with a different example:
2 - 2 + 2
The minus sign only applies to the middle term, by convention. It is the equivalent of "adding negative two". You can quickly see that this expression is equal to 2.
But if you use one of these acronyms, you end with this expression evaluating to -2. I would say it is almost universally accepted that 2 is the correct answer, and -2 is incorrect. Basically, all these acronyms end up being useless waste of time.
I don't know if I conveyed this the first time, but, as a lover of pure mathematics, this is something that does not have application in life or in study. It's an utterly useless waste of time. There is never a case where someone give you numbers like this, where it is not clear what order the numbers should be applied in.
Multiplication comes before division in some forms, like PEMDAS. In the example I use, this changes the answer
If you have both multiplication and division then you do them left to right. PEMDAS doesn't mean multiplication first, nor does BEDMAS mean division first. It's PE(MD)(AS) and BE(DM)(AS) where the bracketed parts are done left to right.
you should specify what it is operating on
Left associativity means it always operates on the following term. i.e. terms are associated with the sign on their left.
The minus sign only applies to the middle term, by convention
By the rule of left associativity.
But if you use one of these acronyms, you end with this expression evaluating to -2
No it doesn't. How on Earth did you manage to get -2?
all these acronyms end up being useless waste of time
No they're not, but I don't know yet where you're going wrong with them without seeing your working out.
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And that kids name? Mathew Matician.
The kid who got it wrong? Numbers McCountyFingers.
I actually remember seeing this on my YouTube feed. I was pretty confused at first until I saw the factorial sign.
OH!
Where is the bell curve
Not related. I love your username
Reject tradition, embrace crab
it's wrong, because:
- i would never ask a kid something like that
- there is a question mark missing
- i don't know any kids and they would probably just flip me off in that situation, which is okay, because they shouldn't talk to strangers
Such a great post lmao
What enrages me is the pairing of "wrong" and "correct".
With pemdas correct if written, incorrect if spoken. Ignoring pemdas the opposite. And verbally if the exclamation is not spoken as factorial
4 factorial is correct lol
Yee, I was in the midst of correcting myself since I was typing off my memory
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