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Half of you will get this wrong: 48÷2(9+3) = 288 or 2?
- Thread starter AKIRA
- Start date
Gotta hand it to you, bud - you were closer to the truth than you could have imagined.
No.Is it this...??
_48_
2(9+3)
as far as i know this is correct, why would you do 2x12 before you would do 48/2 ??
Thats how its tought in my school so if its wrong, the educational system is in deeper shit than i thought
jagbender
Registered
malfeasance
Registered
malfeasance
Registered
Half of us will get it wrong? You pessimist! How about half of us will get it right! 
the funny thing is.... that division and multiplication are of equal magnitude and so are addition and substitution equal to each other so you could technically use PEDMSA and it would still be right, remember we work from left to right when the operation is of equal order so as long as in the acronym division and multiplication are 3rd and 4th it doesnt matter which one is 3rd and which is 4th just the same as addition and subtraction being 5th and 6th
ManInBlack
Registered
ManInBlack
Registered
I think the worst culprit was the distribution method people kept getting confused with, mistaking it as being part of the parentheses first, but if using that method it counts as just Multiplication thus the division has to be done first by the left to right rule....
Order of operation
- Parentheses and Brackets -- Simplify the inside of parentheses and brackets before you deal with the exponent (if any) of the set of parentheses or remove the parentheses.
- Exponents -- Simplify the exponent of a number or of a set of parentheses before you multiply, divide, add, or subtract it.
- Multiplication and Division -- Simplify multiplication and division in the order that they appear from left to right.
- Addition and Subtraction -- Simplify addition and subtraction in the order that they appear from left to right.
Oh dear, did you miss the memo? A professor of mathematics dropped by and offered her authority in the matter of fifth grade math.
I am utterly stunned at the level of innumeracy in this thread. If you spelled a word wrong, and someone with an English degree said, "that's wrong" - you'd take the hit, right?
I have had men on this and other boards ask me for help with training - especially diet; recently gear; I have no qualifications whatsoever in any of these fields and yet, I have read enough on my own to have earned some respect from at least a few of you.
I have two science degrees in applied mathematics. I taught math all the way through both degrees. I earned a national scholarship because my grades were so high. I work in an economics unit and build Access and Excel applications for work off the side of my desk, while I'm doing research and writing up analyses. I know WAY more about math than I know about physical culture - and yet, when I DARED to question your authority, I received INSULTS on this thread; I had a man accuse me of PMS-ing; another who told me to leave science for the menfolk. Now I realize this is in fun but MEN don't get to do that; not yet. It's like the n-word; Anybody else says it, it stings like a whip. I'm white and Canadian and even I can see this.
I'll explain where I am coming from:
I wasn't allowed to take grade 12 math when I wanted to. I got through grades 10 and 11 math when I was in grade ten, earning a nearly 100% average in grade eleven algebra. I wanted to take grade 12 math the next year.
You know what I was ALLOWED to take? Typing.
And some dorky made-up science class called Human Biology where you just basically had to show up to get an A. Oh, and grade 12 geometry. Interestingly, they couldn't keep me out of Electronics. I was the first girl ever to take electronics at Magee high school. Took it through grade 11. It was just like physics, only easier and more fun.
Still though, these weren't the courses I wanted to take. They were just fluffy little courses. I got so bored in school after that I just quit.
I went back to school at 25 when my first husband left, and finished high school. I was really poor; I kept running out of money; I waited tables and worked in a warehouse, did room service Sunday nights at the Hotel Georgia in Vancouver but I kept going. Then I started teaching math - that paid WAY better, so I dropped everything else and just tutored.
All told, it took me me ten years of plugging away at it a few courses at a time, working a semester or two, then another few courses but I just kept at it - and earned a BSc in math. I took my credential in statistics, and earned a $35,000 scholarship for my grades and planned research. I had two universities fighting over me to go to grad school; I sadly followed the money but that's a different story. I completed a graduate degree and defended a thesis in operations research.
I mean really - I live through all that, explain, in detail, over numerous posts, the underpinnings of number theory - and I'm told I'm a stupid woman who needs to concede her "error", take Midol, and go cry somewhere.
Later, a math professor dropped by and blinded you with science - still, I see these posts:
How can you not be ashamed to be so innumerate? People are ashamed when they're illiterate; I feel so sorry for people who haven't had the opportunity to learn how to read.
But the rest of you. I'm beginning to wonder if they teach this stuff at all anymore.
To all you gear-users out there: I hope you dose better than you compute.
I'll give you four good reasons:
Stay safe, hear?
I am utterly stunned at the level of innumeracy in this thread. If you spelled a word wrong, and someone with an English degree said, "that's wrong" - you'd take the hit, right?
I have had men on this and other boards ask me for help with training - especially diet; recently gear; I have no qualifications whatsoever in any of these fields and yet, I have read enough on my own to have earned some respect from at least a few of you.
I have two science degrees in applied mathematics. I taught math all the way through both degrees. I earned a national scholarship because my grades were so high. I work in an economics unit and build Access and Excel applications for work off the side of my desk, while I'm doing research and writing up analyses. I know WAY more about math than I know about physical culture - and yet, when I DARED to question your authority, I received INSULTS on this thread; I had a man accuse me of PMS-ing; another who told me to leave science for the menfolk. Now I realize this is in fun but MEN don't get to do that; not yet. It's like the n-word; Anybody else says it, it stings like a whip. I'm white and Canadian and even I can see this.
I'll explain where I am coming from:
I wasn't allowed to take grade 12 math when I wanted to. I got through grades 10 and 11 math when I was in grade ten, earning a nearly 100% average in grade eleven algebra. I wanted to take grade 12 math the next year.
You know what I was ALLOWED to take? Typing.
And some dorky made-up science class called Human Biology where you just basically had to show up to get an A. Oh, and grade 12 geometry. Interestingly, they couldn't keep me out of Electronics. I was the first girl ever to take electronics at Magee high school. Took it through grade 11. It was just like physics, only easier and more fun.
Still though, these weren't the courses I wanted to take. They were just fluffy little courses. I got so bored in school after that I just quit.
I went back to school at 25 when my first husband left, and finished high school. I was really poor; I kept running out of money; I waited tables and worked in a warehouse, did room service Sunday nights at the Hotel Georgia in Vancouver but I kept going. Then I started teaching math - that paid WAY better, so I dropped everything else and just tutored.
All told, it took me me ten years of plugging away at it a few courses at a time, working a semester or two, then another few courses but I just kept at it - and earned a BSc in math. I took my credential in statistics, and earned a $35,000 scholarship for my grades and planned research. I had two universities fighting over me to go to grad school; I sadly followed the money but that's a different story. I completed a graduate degree and defended a thesis in operations research.
I mean really - I live through all that, explain, in detail, over numerous posts, the underpinnings of number theory - and I'm told I'm a stupid woman who needs to concede her "error", take Midol, and go cry somewhere.
Later, a math professor dropped by and blinded you with science - still, I see these posts:
This. Order of operations as many have said.
How can you not be ashamed to be so innumerate? People are ashamed when they're illiterate; I feel so sorry for people who haven't had the opportunity to learn how to read.
But the rest of you. I'm beginning to wonder if they teach this stuff at all anymore.
To all you gear-users out there: I hope you dose better than you compute.
I'll give you four good reasons:
- T3
- clen
- DNP
- insulin
Stay safe, hear?
Last edited:
I failed Algebra my first time around and still knew why it could only be 288...I think I benefit from a job that forces me to make calculations everyday, a little Ohms Law, a bit of trig to find the length of tilt legs for a flat roof mounted system tilted 30 degrees to the south, a bit of just about all the math I learned up to my associates degree.
This thread is a good case to show kids in school how they might "need this" one day in their future....
ManInBlack
Registered
Thus proving, the ages old addage, that women should stick to reading and writing, and let men take care of the math/science.
Yup I sense a girl brain
ManInBlack
Registered
The fact is, if the writer meant it to be (48/2)(3+9), they would have wrote it as 48(3+9)/2 or as (48/2)(3+9).
the form a/2b is generally meant to mean a/(2b)... if that isn't what you meant you would simply write it as ab/2. Writing it any other way is just mathematically retarded. Reading a/2b as ab/2 just shows that you can regurgitate an acronym and take it so literally that you screw up what was meant by the person writing the equation.
the form a/2b is generally meant to mean a/(2b)... if that isn't what you meant you would simply write it as ab/2. Writing it any other way is just mathematically retarded. Reading a/2b as ab/2 just shows that you can regurgitate an acronym and take it so literally that you screw up what was meant by the person writing the equation.
so it's 2, right?
Jakeyboy696
Registered
What is math? 
malfeasance
Registered
My mind converts it instantly to this, and, after reading all of the explanations from those who think it is 288, including those explanations from people with multiple math degrees, I still fail to see how it can possibly be what you are claiming. It would need to be expressed differently.
NeilPearson makes a good point:
This thing is still alive? I have to admit, I'm kind of appalled.
You've had two people with multiple degrees in mathematics tell you that 1) the question is not ambiguous and that 2) the answer is 288, and there are still posts like this:
Let me break this down for you. a/2b means (a/2)*b. Period. If one means to write a/(2b) then it is written a/(2b).
It is not "mathematically retarded" that a/2b = ab/2. This is simply a FACT. Whether you like it or not has no bearing whatsoever on its truth.
If the person who wrote the problem did, in fact, mean a/(2b), then they are the one who is guilty of making an error for not writing it so.
There is no room for "interpretation" here. It is not the job of the mathematician to assume to know the mind of the person who poses the question.
The fact that your mind converts it to one form or another doesn't constitute an argument for that being correct. The fact that you fail to see the correctness of the multiple arguments Built has given you has no bearing on the correctness of those arguments nor does it imply that the problem needs to be written differently. All you've said here is that you are incapable of recognizing a correct argument.
You've had two people with multiple degrees in mathematics tell you that 1) the question is not ambiguous and that 2) the answer is 288, and there are still posts like this:
Let me break this down for you. a/2b means (a/2)*b. Period. If one means to write a/(2b) then it is written a/(2b).
It is not "mathematically retarded" that a/2b = ab/2. This is simply a FACT. Whether you like it or not has no bearing whatsoever on its truth.
If the person who wrote the problem did, in fact, mean a/(2b), then they are the one who is guilty of making an error for not writing it so.
There is no room for "interpretation" here. It is not the job of the mathematician to assume to know the mind of the person who poses the question.
The fact that your mind converts it to one form or another doesn't constitute an argument for that being correct. The fact that you fail to see the correctness of the multiple arguments Built has given you has no bearing on the correctness of those arguments nor does it imply that the problem needs to be written differently. All you've said here is that you are incapable of recognizing a correct argument.
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