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-   -   Okay Math Geniusues... What's 48÷2(9+3) ? (https://www.yorkietalk.com/forums/off-topic-discussions/225558-okay-math-geniusues-whats-48-2-9-3-a.html)

AllDogBoots 04-07-2011 02:22 PM
Quote:
Originally Posted by linz06 (Post 3490598)
I believe the answer is 288..

48÷2(9+3)

48 ÷ 2 x (9+3)

48 ÷ 2 x 12

24 x 12

=288

After the parentheses, there is only multiplication and division left to do, and they follow left to right.
:thumbup:

Ellie May 04-07-2011 02:26 PM
Please
Excuse
My
Dear
Aunt
Sally

48/2(12)

The 2x12 has to go first.

salazark 04-07-2011 02:34 PM
I think you might be getting 288 when you put it into a calculator based on how you're entering it. If you enter if from left to right you are in essence putting parentheses in without realizing it and thus changing the answer. I agree with 2 for the answer.

linz06 04-07-2011 02:37 PM
Quote:
Originally Posted by salazark (Post 3490676)
I think you might be getting 288 when you put it into a calculator based on how you're entering it. If you enter if from left to right you are in essence putting parentheses in without realizing it and thus changing the answer. I agree with 2 for the answer.
I put it in the equation line exactly as written... 48 ÷ 2 (9+3) then hitting enter for the answer.

Wylie's Mom 04-07-2011 02:39 PM
Let's see (this could be embarrassing):

48 ÷ 2(9+3)
48 ÷ 18 + 6
48 ÷ 24
= 2

Okay, now I'm gonna look :).

Maxman 04-07-2011 02:40 PM
My head hurts!:doh34:

Rhetts_mama 04-07-2011 02:41 PM
Using PEMDAS to solve equations:

Evaluating Algebraic Expressions Order of Operations/P.E.M.D.A.S.

JeanieK 04-07-2011 02:47 PM
you always do the work in the parentheses first.

Order of operations:
The operations inside parentheses () and brackets [] are done first.
Then any operations involving exponents (which you will learn about later).
Then do all multiplying and dividing from left to right.
Finally, do all addition and subtraction from left to right.

Pre-Algebra: Basic Equations - Math for Morons Like Us

48 /2 (9+3)
48/ 2x12
24x12
288

linz06 04-07-2011 02:52 PM
Quote:
Originally Posted by JeanieK (Post 3490693)
you always do the work in the parentheses first.

Order of operations:
The operations inside parentheses () and brackets [] are done first.
Then any operations involving exponents (which you will learn about later).
Then do all multiplying and dividing from left to right.
Finally, do all addition and subtraction from left to right.

Pre-Algebra: Basic Equations - Math for Morons Like Us

48 /2 (9+3)
48/ 2x12
24x12
288
:thumbup::thumbup:
The way the equation is written in a line is what makes everyone get different answers, because most people will just assume that everything after the division sign is the denominator. The 2 in front of the parantheses is not PART of the parentheses, but can be written that way to show multiplication. Multiplication and division are equal, and are carried out left to right.

JeanieK 04-07-2011 02:56 PM
Quote:
Originally Posted by JeanieK (Post 3490693)
you always do the work in the parentheses first.

Order of operations:
The operations inside parentheses () and brackets [] are done first.
Then any operations involving exponents (which you will learn about later).
Then do all multiplying and dividing from left to right.
Finally, do all addition and subtraction from left to right.

Pre-Algebra: Basic Equations - Math for Morons Like Us

48 /2 (9+3)
48/ 2x12
24x12
288

did not mean to quote this'

fasteddie 04-07-2011 03:00 PM
Quote:
Originally Posted by Rhetts_mama (Post 3490687)
Oooh, good link, with great example! THANKS! :)

I've actually been debating this with a few people for a few hours now... ;p

and that's the BEST LINK I've seen to support my answer! Teehee...

The main debeate is if people think the 2(9+3) takes precedence (or should go first) BEFORE the division or not... I personally think you do 2(9+3) first...

JeanieK 04-07-2011 03:32 PM
Quote:
Originally Posted by fasteddie (Post 3490709)
Oooh, good link, with great example! THANKS! :)

I've actually been debating this with a few people for a few hours now... ;p

and that's the BEST LINK I've seen to support my answer! Teehee...

The main debeate is if people think the 2(9+3) takes precedence (or should go first) BEFORE the division or not... I personally think you do 2(9+3) first...
Do only the 9+3 first
then work the equation for left to right.

AMD 04-07-2011 04:27 PM
Quote:
Originally Posted by fasteddie (Post 3490583)
So what's the answer to:

48÷2(9+3)

Show your work... :D
Is this a test? LOL :D

48÷2(9+3)
= 48/2(12)
= 48/24
= 2

AMD 04-07-2011 04:58 PM
Essentially the problem is 48/[2(9+3)]. You cannot split up the demoninator...solve the entire denominator before dividing. It's alot easier to see written as a fraction numerator on top of a demoninator instead of the "/" symbol.

To get 288 as the correct answer, the problem would have to be written (48/2)*(9+3). Otherwise you cannot divide before solving your denominator.

JeanieK 04-07-2011 05:08 PM
Quote:
Originally Posted by AMD (Post 3490839)
Essentially the problem is 48/[2(9+3)]. You cannot split up the demoninator...solve the entire denominator before dividing. It's alot easier to see written as a fraction numerator on top of a demoninator instead of the "/" symbol.

To get 288 as the correct answer, the problem would have to be written (48/2)*(9+3). Otherwise you cannot divide before solving your denominator.
You put the denominator in brackets. it was not in brackets originally.

You solve what is in the parentheses first, then work the multiplication and division left to right.

That is what the rules state.


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