logo
Previous Thread
Next Thread
Print Thread
Page 1 of 6 1 2 3 4 5 6
#681940 04/28/11 01:45 AM
Joined: Feb 2011
Posts: 469
BellaOnline Editor
Gecko
OP Offline
BellaOnline Editor
Gecko
Joined: Feb 2011
Posts: 469
Have you seen this question going round on Facebook?

6�2(1+2)=?

What do you think?

Sponsored Post Advertisement
Joined: Jan 2009
Posts: 60,166
Highest Posting Power Known to Humanity
Offline
Highest Posting Power Known to Humanity
Joined: Jan 2009
Posts: 60,166
I recall the Order of Operation in an arithmetic equation was/is:
Parentheses - Power (Exponent, in some terms) - Multiplication/Division - Addition/Subtraction. This could be remembered by the memonic fo PPMDAS - Pretty Please My Dear Aunt Sally. M/D & A/S are worked from left to right in order.

Thus, the equation would go:
6�2(1+2)
6�2*3
3*3
9
Yes, that is my final answer.


Others work out of 'left-to-right' sequence & come up with:
6�2(1+2)
6�2(3)
6�6
1

Last edited by Beetlemess; 04/28/11 02:31 PM.

-B-
"We do not inherit the Earth from our ancestors,
we borrow it from our children."
Beetlemess #682235 04/29/11 08:32 AM
Joined: Jun 2009
Posts: 4,108
BellaOnline Editor
Elephant
Offline
BellaOnline Editor
Elephant
Joined: Jun 2009
Posts: 4,108
The correct answer is 1. The second way you worked out the equation was correct, Beetle.


Lisa Binion
Fiction Writing

Joined: Jan 2009
Posts: 60,166
Highest Posting Power Known to Humanity
Offline
Highest Posting Power Known to Humanity
Joined: Jan 2009
Posts: 60,166
But you work from left to right when conducting the mathematical operation when working the expression. Can you give me a reference that refutes the standard order of operation?

Further explanation addresses the Associative Properties as a computational strategy. The equation can be rewritten out as:

Six divided by two times the quantity of one plus two
or
Six divided by two times three

These can be grouped & yield the answers:

(6�2)*3 = 3*3 = 9 working left to right
6�(2*3)= 6�6 = 1 working right to left

Division indicates the multiplication of the inverted number, or written out:

6 * 1/2 * (1+2) => (6*3)/2 => 18/2 => 9

Want me to prove that zero equals one? Or how to work a slide rule?

Try the equation on a calculator that has the parenthesis. My Texas Instruments TI-30 SLR+ gives the answer as 9.


Final answer & I still don't need to call a friend or get audience voting.




-B-
"We do not inherit the Earth from our ancestors,
we borrow it from our children."
Beetlemess #682296 04/29/11 11:46 AM
Joined: Jul 2010
Posts: 6,412
Tiger
Offline
Tiger
Joined: Jul 2010
Posts: 6,412
LOL, how do we know the answer?

Is it posted somewhere or are we going by our Bella EXPERTS smile

I am so impressed with how Beetle just jumps in and figures stuff out - way to go Mr. Math!!!!

Joined: Jan 2009
Posts: 60,166
Highest Posting Power Known to Humanity
Offline
Highest Posting Power Known to Humanity
Joined: Jan 2009
Posts: 60,166
Had enough math in getting my degree... & all I wanted to do was fly, so I went the Aerospace route. Okay, I am a rocket scientist.

< addition: My studies came before desktop computers & cheap scientific calculators. It was pencil & paper crunching out the numbers. >

Last edited by Beetlemess; 04/29/11 12:43 PM.

-B-
"We do not inherit the Earth from our ancestors,
we borrow it from our children."
Beetlemess #682489 04/29/11 07:35 PM
Joined: Jun 2009
Posts: 4,108
BellaOnline Editor
Elephant
Offline
BellaOnline Editor
Elephant
Joined: Jun 2009
Posts: 4,108
My husband is the math expert, not me, although I do help students with it in the private school I volunteer at. I will ask others at school about it Monday and will have my husband look at it again later when he gets home, but from what I have learned, it is worked in the following way.

You need to use distributive property in this problem. First things first, (1+2) =3 .

6 / 2(3)
6 / 6 = 1

You need to eliminate the parentheses before you can move on to dividing.


Lisa Binion
Fiction Writing

Joined: Apr 2011
Posts: 4
Newbie
Offline
Newbie
Joined: Apr 2011
Posts: 4
Well I'm definitely no rocket scientist, but I have stayed in a Holiday Inn Express! :) I also had a middle school algebra teacher who REFUSED to let me sleep in his class (Thank you Mr.Brammer!) I consulted [i]Basic Rules of Algebra, Algebraic Fractions, Laws of Exponents, and Roots/Radicals[/i] by Charles Ormsby. He states &quot;Letters or symbols should be considered placeholders for numbers...) Let's replace the 2 inside the parenthesis with x and see how this problem works out 6 / 2(1+x) 6 / (2+2x) or on a blackboard would be written [u]6[/u] (2+2x) plug 2 back in for x and you get 1 You are correct Lisa Using a variable forces you to keep the parenthesis and use the distributive property, which you should do anyway. Mr.Brammer forced us to work hundreds of these on the blackboard in front of the class. (This was before schools worried about kid's &quot;self esteem) He didn't care to berate you a little if you kept getting them wrong. Thanks again Mr.Brammer, RIP

old school #682582 04/30/11 10:40 AM
Joined: May 2010
Posts: 10,708
Likes: 27
BellaOnline Editor
Medieval Human
Offline
BellaOnline Editor
Medieval Human
Joined: May 2010
Posts: 10,708
Likes: 27
Odd thing to be going around on Facebook.

But the answer is 1.

In the right hand term, 2+1 in brackets equals 3, just as it does when it's not in brackets. Multipled by the 2 next to it, you get 6. 6 divided by 6 is 1.


Mona Evans
For news, activities, pictures and more, sign up to the Astronomy Newsletter!

http://www.bellaonline.com/newsletter/astronomy
Joined: Feb 2011
Posts: 469
BellaOnline Editor
Gecko
OP Offline
BellaOnline Editor
Gecko
Joined: Feb 2011
Posts: 469
Well we know to do the brackets first and 2+1 = 3
but when once you get
6/2(3)
the question is, where do you go from there?
If it were written 6 / 2 x 3 the answer would be 9
but if the 3 were an x and it were written 6/2x, the answer would be 1

Page 1 of 6 1 2 3 4 5 6

Moderated by  Beverly - Math Coach 

Link Copied to Clipboard
Brand New Posts
It's 2022 - on this day in the past . . .
by Mona - Astronomy - 09/26/22 02:23 PM
Inspiration Quote
by Angie - 09/26/22 08:45 AM
Psalm for the day
by Angie - 09/26/22 08:23 AM
KULFI FINANCE: LEND AND BORROW CRYPTO ASSETS AT A
by Jamal molla - 09/25/22 01:04 PM
KULFI FINANCE: LEND AND BORROW CRYPTO ASSETS AT A
by Jamal molla - 09/24/22 07:59 AM
KULFI FINANCE: LEND AND BORROW CRYPTO ASSETS AT A
by Jamal molla - 09/24/22 07:59 AM
Tea Samples
by Angie - 09/22/22 09:31 PM
Tailgate Recipes
by mary-tea1 - 09/22/22 12:47 PM
Who's Excited For Football 2022
by mary-tea1 - 09/22/22 12:43 PM
Where can one buy Baseball Cards?
by mary-tea1 - 09/22/22 12:40 PM
Sponsor
Safety
We take forum safety very seriously here at BellaOnline. Please be sure to read through our Forum Guidelines. Let us know if you have any questions or comments!
Privacy
This forum uses cookies to ensure smooth navigation from page to page of a thread. If you choose to register and provide your email, that email is solely used to get your password to you and updates on any topics you choose to watch. Nothing else. Ask with any questions!


| About BellaOnline | Privacy Policy | Advertising | Become an Editor |
Website copyright © 2022 Minerva WebWorks LLC. All rights reserved.


Powered by UBB.threads™ PHP Forum Software 7.7.5