Basic math.. Who knows it?
Replies
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posted some explanations on the original post.
thank you to everyone who answered 7, or at least didn't defend an incorrect answer with incorrect processes.
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The 7 year old me feels pretty good about himself right now.
However, I probably have forgotten all the algebra I learned a few years ago so I guess everyone has things that aren't their thing.0 -
Most 4-function calculators cannot do order of operations correctly. If you use a scientific calculator which can evaluate multiple operations at once (for a free online one, go to wolframalpha.com), you will get the correct answer of 7.
To my surprise the windows calculator gets this problem right. I'd never trust a calculator with something like this though so I didn't know it would get it right!
Not sure about your version of windows -- in my version (older) it does it correctly in scientific mode and incorrectly in standard mode, which is just wild
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Please restore my faith in humanity...
I know the thing says "comment with your answer only" but I would like that to say "show your work!"
Remember elementary and middle school?
(i apologize if i have brought back repressed memories of creepy math teachers)
(big hint: the answer is not 0, 1 or 3... or 9 or 12!) here's why:
AFTER 6 PAGES I'M EDITING TO ADD THIS IN... SPOILERS?
PEMDAS is the order of operations. parentheses, exponents, multiplication, division, addition and subtraction.
so, you do the multiplication first 5x0=0
that makes the problem 9-5+3.
when you get to addition and subtraction you work the problem left to right, 9-5 = 4. then 4+3 = 7.
IF you chose to do addition first, you need to be sure to take the symbol in front of the number with it, thus making the problem 9+ (-5) + 3 which, is still 7.
it's not 0 because the whole equation isn't multiplied by 0, only 5. for it to be zero it would have to read (9-5+5-3) x 0
it's not 1, because when you do the addition first, it's not 5+3, it's -5+3 which is -2, and 9 + (-2) is 7.
it's not 3, because you don't do the problem left to right, you have to do the multiplication first. for the answer to be three it would have to read (9-5+5) x 0 + 3
it's not 9 because you can't cancel out the -5+5 without doing the multiplication first.
and answers of 7 make me happy.
(clear?)
PEDMAS
9 - 5 + (5 x 0) + 3
9 - 5 + 0 + 3
9 - (5 + 0 + 3)
9 - 8 = 1
Edit: And yes I added the parentheses for clarification.0 -
I think I just burned 50 calories..........:bigsmile:0
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Most 4-function calculators cannot do order of operations correctly. If you use a scientific calculator which can evaluate multiple operations at once (for a free online one, go to wolframalpha.com), you will get the correct answer of 7.
To my surprise the windows calculator gets this problem right. I'd never trust a calculator with something like this though so I didn't know it would get it right!
Not sure about your version of windows -- in my version (older) it does it correctly in scientific mode and incorrectly in standard mode, which is just wild
Sure enough. Same here. I never would have predicted that either!0 -
sigh. it doesn't become 9-8... you don't add 5+3 you have to add -5 + 3...0
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some of you need to lighten up
i don't think answers to this math equation predict the fate of humanity
Oh man am I going to laugh when the fate of humanity comes down to having 9-5+5x0+3 rounds of ammunition per 7 zombies.0 -
PEDMAS
9 - 5 + (5 x 0) + 3
9 - 5 + 0 + 3
9 - (5 + 0 + 3)
9 - 8 = 1
This is incorrect -- addition and subtraction are done at the same time, left to right -- because subtraction is really just adding the negative. It really could be written as PE(MD)(AS) for clarity.0 -
This thread is just getting worse and worse...0
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some of you need to lighten up
i don't think answers to this math equation predict the fate of humanity
Oh man am I going to laugh when the fate of humanity comes down to having 9-5+5x0+3 rounds of ammunition per 7 zombies.
:laugh: :laugh: :laugh:0 -
Well, based on the fact that people are still getting the wrong answer, despite the correct answer having been posted several times, I conclude that while some of us are not great at math, we are an honest bunch.
Well done.0 -
Well, based on the fact that people are still getting the wrong answer, despite the correct answer having been posted several times, I conclude that while some of us are not great at math, we are an honest bunch.
Well done.
You always find the shining ray of hope.0 -
i even posted the answer and the explanation of the wrong answers on the first page. i guess i suck at explanations.0
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i even posted the answer and the explanation of the wrong answers on the first page. i guess i suck at explanations.
Nope, your explaination on page 2 was excellent.0 -
Well, based on the fact that people are still getting the wrong answer, despite the correct answer having been posted several times, I conclude that while some of us are not great at math, we are an honest bunch.
Well done.
though i could be the cynic and say 'not necessarily honest, just confident based on erroneous explanations'0 -
i even posted the answer and the explanation of the wrong answers on the first page. i guess i suck at explanations.
No, you're great.0 -
Well, based on the fact that people are still getting the wrong answer, despite the correct answer having been posted several times, I conclude that while some of us are not great at math, we are an honest bunch.
Well done.
Sarcasm.... smells like bacon 0 -
7 0
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some of you need to lighten up
i don't think answers to this math equation predict the fate of humanity
Maybe math illiteracy in the general public won't destroy humanity. However, education is my life's passion, and it's seriously depressing me how it has failed so many.
I'll give you that, there are a lot of problems with the education system.
However, just because people in this thread cannot answer the question does not mean they've been failed or that they should be ashamed of themselves.
I couldn't answer this question...do I know basic math? nope. My syntax is atrocious. I had great teachers but I never applied myself. I have also forgotten most of what I have learned because I do not use it. That being said, I am on the honour roll in the top university in my country...hence why I don't feel like whether people can answer this math question or not predicts the fate of our humanity.
I completely agree with that their are issues with the education system. I just think there was quite a dramatic reaction from some people to what I thought was a light, fun thread.0 -
some of you need to lighten up
i don't think answers to this math equation predict the fate of humanity
Oh man am I going to laugh when the fate of humanity comes down to having 9-5+5x0+3 rounds of ammunition per 7 zombies.
hahaha i'll be screwed0 -
i don't know if it's a consolation or if it's just more depressing...
but there were more correct answers here than when i saw it posted on facebook.
so either this bunch is smarter than the general public, or the youngins that seem to dominate facebook can't remember math they have probably done in school recently.0 -
3...Anything times 0 = 0...then add 3 = answer is 3.0
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Well, based on the fact that people are still getting the wrong answer, despite the correct answer having been posted several times, I conclude that while some of us are not great at math, we are an honest bunch.
Well done.
though i could be the cynic and say 'not necessarily honest, just confident based on erroneous explanations'
You could be, but that doesn't sound like something you'd do.0 -
New website: www.mymathfitnesspal.com, providing calorie tracking and remedial math help. Coming soon. Keep your eyes peeled.0
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3...Anything times 0 = 0...then add 3 = answer is 3.
the only thing times 0 in that expression is 5.
the 9 - 5 has to be done later because of the order of operations.0 -
New website: www.mymathfitnesspal.com, providing calorie tracking and remedial math help. Coming soon. Keep your eyes peeled.
Lol.
And for starters, you have to add your calories ... YOURSELF!0 -
Well, based on the fact that people are still getting the wrong answer, despite the correct answer having been posted several times, I conclude that while some of us are not great at math, we are an honest bunch.
Well done.
though i could be the cynic and say 'not necessarily honest, just confident based on erroneous explanations'
You could be, but that doesn't sound like something you'd do.
no, not generally, though i might... were i not in such a giving mood right now.
providing basic math tutoring to the masses for free.0 -
New website: www.mymathfitnesspal.com, providing calorie tracking and remedial math help. Coming soon. Keep your eyes peeled.
Lol.
And for starters, you have to add your calories ... YOURSELF!
Half the people in this thread are screwed then...0 -
New website: , providing calorie tracking and remedial math help. Coming soon. Keep your eyes peeled.
Lol.
And for starters, you have to add your calories ... YOURSELF!
I can't even IMAGINE the help forum on that site.0
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