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HelicopterOff Topics › simple math problem?
04-29-2011 01:26 AM  6 years agoPost 1
Dood

rrProfessor

Wescanson

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If you've been on facebook in the last 24 hours, you might have seen a poll appear in your news feed.

The question is a simple(?) math problem.

6÷2(1+2)=

You have two choices. 1 or 9.

I'm not looking for the answer, because I know its 9, I just want to see what the people of Runryder think. Post your answer, either 1 or 9 in the form of a reply to this topic.

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04-29-2011 01:31 AM  6 years agoPost 2
PJRono

rrKey Veteran

Minnesota, Ya!

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The flippin' answer is 9!

If you skip me I can't play!

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04-29-2011 02:02 AM  6 years agoPost 3
ppridday

rrKey Veteran

Detroit Lakes MN

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It's 9

Paul

"There's someone in my head, but it's not me..."

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04-29-2011 02:32 AM  6 years agoPost 4
Raptorz499

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NJ

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It's 1

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04-29-2011 02:43 AM  6 years agoPost 5
702nitro

rrKey Veteran

Las Vegas, NV

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6÷2(1+2)=

---> 6÷2(3)
---> 3(3) = 9

OR

6÷2(1+2)=

---> 6 ÷ 2 x 3 =
---> 3 x 3 = 9

Division and multiplication have the same precendence, therefore it is left associative.

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04-29-2011 02:44 AM  6 years agoPost 6
eggmcmuffinplz

rrElite Veteran

   

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its 1

view it as 6 ALL OVER 2(2+1)

so

6
____
2(2+1)

therefore 3x2=6

6
___
6

=1 viola

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04-29-2011 03:24 AM  6 years agoPost 7
EvoFlight50

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Southbury, CT

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If it was 6 all over 2(2+1) it would read

6/(2(2+1))

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04-29-2011 03:27 AM  6 years agoPost 8
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Order of operations

PleaseExcuseMyDearAuntSally (Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction)

So:

6/2(1+2)
6/2(3)
6/6
1

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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04-29-2011 03:31 AM  6 years agoPost 9
EvoFlight50

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Southbury, CT

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It's multiplication and division, addition and subtraction. They're on equal levels.

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04-29-2011 03:50 AM  6 years agoPost 10
Dood

rrProfessor

Wescanson

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I messaged a friend on Facebook who thought the answer was 1.
He pulled the "PEMDAS" card, and asked me to prove it.

This is copy & paste of the explanation I sent him on Facebook.
Yes, PEMDAS. And with PEMDAS I can prove it.
The expression is 6÷2(1+2)

I can simplify this as 6÷2(3) or 6÷2 x (3)
The expression is now just division and multiplication problem, which like addition and subtraction, is done left to right.

6/2=3
3*3=9

If the expression were written differently, as 6÷(2(1+2))... Remember, according to PEMDAS, we work inside the parentheses first.
it could be simplified as follows:
6÷(2(3)) to 6÷(6), which in that case the answer would be 1, and you would be right..

but--- There is no second set of parentheses, and the answer would not be 1, and you would wrong.
To all those who say the answer is 1, and the more than 1 half million people on Facebook who also believe the answer is 1, you're wrong.

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04-29-2011 03:50 AM  6 years agoPost 11
jcrack_corn

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End of Time

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lol you guys are funny.

the answer is 1. sorry if you dont know why.

------------------------------------------------------------------
do it inverted
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04-29-2011 04:01 AM  6 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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6 ÷ 2(1+2) =

6 ÷ 2 X (1 + 2) =

6 ÷ 2 X 3 =

3 X 3 =

9

Simply because there isn't a space between the 2 and the (1 + 2) components of the equation doesn't mean you take care of the (1 + 2) first, then multiply the result by 2. It just means someone got lazy and left the multiplication operator out of the equation. The person who wrote the quiz also assumes that if you don't SEE the operator (in this case the missing "X" for multiply), that the reader will mentally insert the missing operand into the equation.

Write it out properly as shown above, turn the crank. Your Motherly Dear Aunt Sally would be proud of you.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-29-2011 04:07 AM  6 years agoPost 13
jcrack_corn

rrVeteran

End of Time

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there is no possible way it will fly. because the treadmill is pulling backwards at an equal speed to the forward motion = no lift

------------------------------------------------------------------
do it inverted
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04-29-2011 04:14 AM  6 years agoPost 14
dkshema

rrMaster

Cedar Rapids, IA

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Found this bit of wisdom on a math Q & A site:
Dropping the 'X' and cramming two variables together is not the same as putting parentheses around them, even though it's somewhat natural for a human brain to interpret it that way in some contexts.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-29-2011 04:18 AM  6 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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It's multiplication and division, addition and subtraction. They're on equal levels.
That would be wrong. Multiplication and Division are on equal levels with each other.

Addition and Subtraction are on equal levels.

Multiplication and division are NOT on the same level as addition and subtraction.

In this case the addition of parentheses forces you to do the addition first. Once that happens, it's left to right as you encounter the operator. The "X" operator is implied.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-29-2011 04:25 AM  6 years agoPost 16
classic

rrElite Veteran

All over the place!

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The real answer is ...7
The two 2's cancel each other out.
Hooked on phonics all the way baby!
JK!

Which is worse, ignorance or apathy? I don't know and I don't care!

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04-29-2011 01:03 PM  6 years agoPost 17
helibill

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London, Ontario, Canada

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It's worrisome that some of you are getting an answer other than 9...

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04-29-2011 02:20 PM  6 years agoPost 18
koppter

rrApprentice

Virginia

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the problem with PEMDAS is that many students interpret it as meaning that multiplication has precedence over division, and addition takes precedence over subtraction. as has been stated, when both operations appear in an equation or expression, you simply move left to right. Parentheses come first, so what you are left with is

6 divided by 2 times 3. which is 9

i'll throw this at my students this morning...by the way, at least in california, this is 4th grade math.

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04-29-2011 02:39 PM  6 years agoPost 19
Steff Giguere

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St-Eustache, Quebec, Canada

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See how simple it is?

Team Synergy, Rail blades, Team Scorpion, V-Team

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04-29-2011 02:56 PM  6 years agoPost 20
Dood

rrProfessor

Wescanson

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i'll throw this at my students this morning...by the way, at least in california, this is 4th grade math.
Please be sure to share your results.
What grade do you teach?

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