Okay Math Geniusues... What's 48÷2(9+3) ?

[megansmomma]

Originally Posted by MaddiesMommie

I actually teach this skill in 5th grade. YES, PEMDAS is used ANY time you have multiple operations however, what most people forget is even though multiplication and division are at the same level and the left to right rule applies, parentheses () outrank division.

This problem is written with the 2 with the parentheses, therefore, the 2 must stay with them until it is complete. This indicates that the values must be multiplied before doing any other operation.

48÷2(9+3) is different than 48÷2X(9+3)
this answer =2 this answer is =288
The 2 beside the ()
means you must X
2 by the answer inside
to be finished.

Now, thanks for making me work on my last day of spring break.

So are you trying to say the title of this thread should be changed to

WHO'S SMARTER THAN A 5TH GRADER

[MaddiesMommie]

Originally Posted by megansmomma

So are you trying to say the title of this thread should be changed to

WHO'S SMARTER THAN A 5TH GRADER

sounds about right.

[AMD]

Originally Posted by linz06

You could only factor it into 1/[12(x+2)] if you are writing it in a line form. In fraction form, that would be

1
_______
12(x+2)

and to write that in a line, you would have to show [ ] around the bottom to show it is all a denominator. Without those brackets, 1/12(x+2) would just be:

1
__ (x+2)
12

Yes you can add brackets which makes it easier to see but either way you cannot separate the factor in the denominator.
Otherwise it would have to be expressed (1/12)(x+2) and then the second example would be correct.
Anytime a number is multiplied by parenthesis, you can 1) distribute or 2) solve the parenthesis and multiply by your factor; but you have to solve the demonimator completely before performing the division operation.

48÷2(9+3) = 2
My Calculus teacher would stick it to me if I gave 288 as an answer to that algebra problem.

[Ellie May]

2 is a factor of (9+3). That is why it touches the (). You can't just separate it.

[AMD]

Originally Posted by Ellie May

2 is a factor of (9+3). That is why it touches the (). You can't just separate it.

Exactly

The biggest confusion is when to remove parenthesis; and I'll say that I never remove them until it's solved or else I'm . . . . . . ya.

[Ellie May]

Somebody brought up the factor point and it makes the most sense. If something is touching () in my algebra classes and I were to just separate the two, my profs would have something to say about it...

[Rhetts_mama]

Originally Posted by Ellie May

2 is a factor of (9+3). That is why it touches the (). You can't just separate it.

Exactly. If there were a * or x between the 2 and the parenthesis then you would work left to right and come up with 288.

[Ellie May]

Saw this on another forum. Replace 2 with x:

48/x(9+3)=288
the x has to be distributed.
48/9x+3x=288
48/12x=288
x is not = to 2 here because that would make the equation read 2=288.

48/x(9+3)=2
48/9x+3x=2
48/12x=2
x=2

The first one is not true.
2(9+3) and 2x(9+3) are different.

[ladyjane]

It is 288 and should not have been written like that.

[107barney]

Originally Posted by ladyjane

It is 288 and should not have been written like that.

Yep! It's 288.

[kjc]

It's 2.

Like if Teddy had 5 biscuits and Peek a Boo stole 3 of them away, Teddy would have 2 left and Peek a Boo would have none. (Because he ate his!)

2 two der dos swie (sp) TWO!

[107barney]

Originally Posted by kjc

It's 2.

Like if Teddy had 5 biscuits and Peek a Boo stole 3 of them away, Teddy would have 2 left and Peek a Boo would have none. (Because he ate his!)

2 two der dos swie (sp) TWO!

Teddy has 288 biscuits !

[linz06]

Originally Posted by 107barney

Teddy has 288 biscuits !

LOL!!! I agree.

I think Teddy will agree with 288 too

[Bitsy]

Originally Posted by linz06

LOL!!! I agree.

I think Teddy will agree with 288 too

Okay...now I see why Teddy wants the answer to be 288.

Teddy...you can get extra credit for being cute!

[Bitsy]

Originally Posted by ladyjane

It is 288 and should not have been written like that.

Hahaha....that made me laugh!