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View Poll Results: 48÷2(9+3) = ???

288


128 
47.76% 
2


140 
52.24% 


05142012, 12:48 PM


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wow lol.
The order of operations is just like was stated above:
Parenthesis, multiplication and divison(left to right), addition and subtraction(left to right).
Or google it...
The correct answer is definitely 288.


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05302012, 03:45 PM


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Quote:
Originally Posted by mbehlok
If you google for "48÷2(9+3) =" It comes back with an answer of 288.. And we all know that google is never wrong.. haha

yup and the calculator on my phone gives the same answer. 288.


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05302012, 11:42 PM


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06192012, 03:20 PM

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07172012, 05:08 AM

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Quote:
Originally Posted by davidonmars
saw it on other car forums and alot of people seem to think its 2 so i wanted to see what you guys thought

It is 2
You do the calculation inside the parentheses 1st & that number is multiplied by the number next to the parentheses:
48÷2(9+3) = ???
That translates to 48÷2x12, or 48÷24
which of course = 2.
Or, put another way, the problem is 48 divided by what? You have to figure out what the what is 1st !!


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07172012, 09:02 AM


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Quote:
It is 2
You do the calculation inside the parentheses 1st & that number is multiplied by the number next to the parentheses:
48÷2(9+3) = ???
That translates to 48÷2x12, or 48÷24
which of course = 2.
Or, put another way, the problem is 48 divided by what? You have to figure out what the what is 1st !!

That's incorrect.
48÷2(9+3) = ?
48÷2*12 = ?
24*12 = ?
= 288
Order of operations is parenthesis, multiplication and divison(left to right), addition and subtraction(left to right).
You went right to left with multiplication and division.


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07172012, 09:52 AM

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Quote:
Originally Posted by snrusnak
That's incorrect.
48÷2(9+3) = ?
48÷2*12 = ?
24*12 = ?
= 288
Order of operations is parenthesis, multiplication and divison(left to right), addition and subtraction(left to right).

You're trying to do it like reading a sentence (is that the "new math"?), but the math & the description still don't match.
As a math professor commented in an article on the problem (I didn't realize it had been around on the 'net for a while), you wouldn't write an equation that way anymore, but this is what it boils down to:
the number to the left of the division sign is a whole number  you do not need to go thru any steps to find out what it is, and that number (48) is to be divided by (not into) something. But the something is a calculation which has not yet been finished, so you have to finish it first.
Written this way it's easier to see:
48
_______
2(9+3) Or, you could write it like this:
48 ÷ a = x
a = 2(9+3)
What is the value of x?
Obviously you have to figure out what "a" is first!
Whenever there's a whole number on one side (be it left or right) of an operator (+, , x, or ÷) & an unfinished calculation on the other side, you have to do the unfinished calculation first.


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07172012, 10:17 AM


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It's not "new math", it's standard order of operations, based on how it's written.
It wasn't written as:
48
_______
2(9+3)
You're using implied multiplication to solve, which isn't really wrong, but it doesn't follow standard order of operations, which generally takes precedent. It's really open to interpretation, but if you strictly follow standard order of operations the answer is 288.
Nobody would ever write an equation like that though(other than for a purpose like this) because the use of the division sign in equations causes confusion on order of operations.


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07172012, 10:55 AM

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Quote:
Originally Posted by snrusnak
It's not "new math", it's standard order of operations, based on how it's written.

It must be "new math". Note the difference in our ages (upper section of messages)  I went to kindergarten, grade school & high school 19581971, then to 2 universities after that & by the time you were born (my son is 1 year older than you) I was the engineer in a small custom manufacturing facility, doing all the design work, making all the prototype parts & designing, building, installing & teaching operators to run various types of production machinery. Which of course I wouldn't have been able to do if I couldn't do a simple math problem!
Quote:
It wasn't written as:
48
_______
2(9+3)

But both ways the equation means exactly the same thing. It's 48 divided BY, not INTO.
Quote:
You're using implied multiplication to solve, which isn't really wrong, but it doesn't follow standard order of operations, which generally takes precedent. It's really open to interpretation, but if you strictly follow standard order of operations the answer is 288.

The way I was taught is the way I described  when there's a whole number on one side of an operator & an unfinished calculation on the other side you finish that calculation first. Always, always, always. Because if you don't you'll get different results from the same equation  exactly the problem we're talking about !!!
About the time I finished high school (1971) people were talking about the "new math", whatever that was  I was never taught anything different in college either. But then again, I haven't taken a college course since 1979.


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Last edited by ArtNJr; 07172012 at 11:02 AM.

07172012, 12:15 PM

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Quote:
Originally Posted by snrusnak
Nobody would ever write an equation like that though(other than for a purpose like this) because the use of the division sign in equations causes confusion on order of operations.

Here ya go  I happened across this site on the "PEMDAS Rule":
http://www.mathsisfun.com/operationorderpemdas.html
From that page:
_______________________
"Order of Operations  PEMDAS"
when you see something like ...
7 + (6 × 5^2 + 3)
(5 squared  can't type the 2
slightly above & to the right of the 5)
... what part should you calculate first?
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7 + (6 × 5^2 + 3)
7 + (6 × 25 + 3) Start inside Parentheses, and then use Exponents First
7 + (150 + 3) Then Multiply
7 + (153) Then Add
7 + 153 Parentheses completed, last operation is an Add
160 DONE !
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Same thing there as I was trying to explain  the whole number 7 is NOT part of the equation until AFTER the unfinished part has been completed.


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