48÷2(9+3) = ??

2011-04-09 17:38:55

#301

Hurricane2k9: Pendulous Sweaty Balls; +1,538|5946|College Park, MD

unnamednewbie13 wrote:
Hurricane2k9 wrote:
Nah, we don't use calculators on exams for my calc class either. They give you numbers you can actually work in your head and on paper. That way you really learn the process instead of just knowing what to punch in the calculator.
Most math books adopted by the schools I went to had a horrible habit of inserting trick questions instead of simply showing you how to do something. I mostly used my own materials to figure shit out, but a lot of people took to simply copying the answers in the back of the book and skimming by on great assignment scores, but dismal test scores.

Yep that's a stupid way of doing things, but they do say "Cs get degrees."

Whether they get jobs is another question

https://static.bf2s.com/files/user/36793/marylandsig.jpg

2011-04-09 17:46:42

#302

Jay: Bork! Bork! Bork!; +2,006|5603|London, England

unnamednewbie13 wrote:
Hurricane2k9 wrote:
Nah, we don't use calculators on exams for my calc class either. They give you numbers you can actually work in your head and on paper. That way you really learn the process instead of just knowing what to punch in the calculator.
Most math books adopted by the schools I went to had a horrible habit of inserting trick questions instead of simply showing you how to do something. I mostly used my own materials to figure shit out, but a lot of people took to simply copying the answers in the back of the book and skimming by on great assignment scores, but dismal test scores.

Weird. I never had a prof that collected homework.

"Ah, you miserable creatures! You who think that you are so great! You who judge humanity to be so small! You who wish to reform everything! Why don't you reform yourselves? That task would be sufficient enough."
-Frederick Bastiat

2011-04-09 17:48:42

#303

Hurricane2k9: Pendulous Sweaty Balls; +1,538|5946|College Park, MD

Jay wrote:
unnamednewbie13 wrote:
Hurricane2k9 wrote:
Nah, we don't use calculators on exams for my calc class either. They give you numbers you can actually work in your head and on paper. That way you really learn the process instead of just knowing what to punch in the calculator.
Most math books adopted by the schools I went to had a horrible habit of inserting trick questions instead of simply showing you how to do something. I mostly used my own materials to figure shit out, but a lot of people took to simply copying the answers in the back of the book and skimming by on great assignment scores, but dismal test scores.
Weird. I never had a prof that collected homework.

these days it's all online

2011-04-09 17:48:50

#304

unnamednewbie13: Moderator; +2,053|7016|PNW

College math I took was far more test-oriented for the final grade, as it should be. Gradeschool was more like "do your best and you'll pass." Junior and high school was when kids started figuring out how to work the system in their short term favor.

2011-04-10 04:43:22

#305

presidentsheep: Back to the Fuhrer; +208|6206|Places 'n such

I never got that you're allowed to use graphical calculators in A-Level maths exams. In my resit in january i forgot to bring/borrow one before the exam and there turned out to be an 8 mark question (out of 72) on plotting two equations and stating where they intercepted. Needless to say it took me longer than everyone else to complete that question

I'd type my pc specs out all fancy again but teh mods would remove it. Again.

2011-04-10 04:48:36

#306

Cybargs: Moderated; +2,285|6961

Jay wrote:
unnamednewbie13 wrote:
Hurricane2k9 wrote:
Nah, we don't use calculators on exams for my calc class either. They give you numbers you can actually work in your head and on paper. That way you really learn the process instead of just knowing what to punch in the calculator.
Most math books adopted by the schools I went to had a horrible habit of inserting trick questions instead of simply showing you how to do something. I mostly used my own materials to figure shit out, but a lot of people took to simply copying the answers in the back of the book and skimming by on great assignment scores, but dismal test scores.
Weird. I never had a prof that collected homework.

Most HW is done by tutorials/recitals instead of lectures.

https://cache.www.gametracker.com/server_info/203.46.105.23:21300/b_350_20_692108_381007_FFFFFF_000000.png

2011-04-12 16:56:26

#307

Graphic-J: The Artist formerly known as GraphicArtist-J; +196|6371|So Cal

-288

2011-04-15 20:28:33

#308

Hurricane2k9: Pendulous Sweaty Balls; +1,538|5946|College Park, MD

lol this ended up on UMD's section of CollegeACB

http://collegeacb.com/sb/Maryland/thread/1093988

2011-04-15 23:06:31

#309

Beduin: Compensation of Reactive Power in the grid; +510|5995|شمال

288

الشعب يريد اسقاط النظام
...show me the schematic

2011-04-15 23:18:41

#310

NeXuS: Shock it till ya know it; +375|6586|Atlanta, Georgia

42

2011-04-15 23:19:07

#311

unnamednewbie13: Moderator; +2,053|7016|PNW

Went to see if I could get my suspicions confirmed. Remembered that I asked, and got this on April 8. They were. Perhaps this could shed some light on the problem:

We've dealt with the same thing here many times over the years, and I
basically agree with you that it is ambiguous enough to simply avoid
ever writing anything of this form.

There is no standard rule that tells you to do the multiplication
first, though the rule makes sense at least visually. Some texts
actually teach such a rule, but forget to tell their readers that it
is not standard. The left to right approach yielding 288 is the only
interpretation that fits the usual set of rules; but it is so easy to
misread that I'd avoid it. The fact that mathematicians hardly ever
use the in-line division symbol in the first place, using the fraction
bar instead, makes it a moot point.

Here are some of my own discussions of the topic:

Order of Operations Dispute
http://mathforum.org/library/drmath/view/57025.html

Order of Operations
http://mathforum.org/library/drmath/view/54341.html

More on Order of Operations
http://mathforum.org/library/drmath/view/57021.html

Implied Multiplication and TI Calculators
http://mathforum.org/library/drmath/view/72166.html

Your attempt to solve this as an equation doesn't really do anything,
because when you solve you are making implicit assumptions about the
order of operations.

If you have any further questions, feel free to write back.

- Doctor Peterson, The Math Forum

The left->right 24 * 12 would be the logical way to read it, and dividing (9+3) from both sides as I tried earlier (for 48/2 = x/12) seems to confirm it. So you can all stop saying that 288 is stupid. As suggested before, it is indeed sloppy mathematical 'grammar' to blame for the confusion, and it even throws some calculators for a loop.

2011-04-15 23:48:42

#312

DrunkFace: Germans did 911; +427|6926|Disaster Free Zone

It's not logical.

2011-04-15 23:53:55

#313

unnamednewbie13: Moderator; +2,053|7016|PNW

Maybe that's not the word I should have used. Replace it with this, and let's bury the fucking hatchet.

The left to right approach yielding 288 is the only
interpretation that fits the usual set of rules; but it is so easy to
misread that I'd avoid it. The fact that mathematicians hardly ever
use the in-line division symbol in the first place, using the fraction
bar instead, makes it a moot point.

2011-04-16 00:10:49

#314

DrunkFace: Germans did 911; +427|6926|Disaster Free Zone

12/6 = 2
3*2 = 6
12/3*2 = 6??
No if you split a term you must then put it into brackets. ie.
12/(3*2)

Same applies to 2(9+3), if you split it with a multiplication sign you then have to write it (2*(9+3)).

2011-04-16 00:23:43

#315

Beduin: Compensation of Reactive Power in the grid; +510|5995|شمال

DrunkFace wrote:
12/3*2 = 6??

8

:p

Last edited by Beduin (2011-04-16 00:24:11)

الشعب يريد اسقاط النظام
...show me the schematic

2011-04-16 00:24:50

#316

mtb0minime: minimember; +2,418|6899

48÷2(9+3) = 288
48÷(2(9+3)) = 2

simple as.

48÷2(9+3)
48÷2(12)
48÷2*12
24*12
288

do we really have to keep doing this?

2011-04-16 00:27:34

#317

DrunkFace: Germans did 911; +427|6926|Disaster Free Zone

288 42% 42% - 36
2 57% 57% - 48

By general consensus... 2 wins.

Also

2(12)= (2*12) not 2*12

Last edited by DrunkFace (2011-04-16 00:28:34)

2011-04-16 02:13:21

#318

justice: OctoPoster; +978|6986|OctoLand

I declare this thread a success

I know fucking karate

2011-04-16 03:40:27

#319

Beduin: Compensation of Reactive Power in the grid; +510|5995|شمال

justice wrote:
I declare this thread a success

الشعب يريد اسقاط النظام
...show me the schematic

2011-04-16 04:31:02

#320

Spamtheban: Undsiputed BF2s FIFA champion of all time; +132|5087|Stoke

2

2011-04-16 05:19:06

#321

Hurricane2k9: Pendulous Sweaty Balls; +1,538|5946|College Park, MD

DrunkFace wrote:
It's not logical.

kill yourself

2011-04-16 07:16:26

#322

unnamednewbie13: Moderator; +2,053|7016|PNW

= what I just said in my last two posts this thread

The amount of silly stuff that general consensus has supported in the past sort of leads me to disregard the results of this poll.

2011-04-16 09:41:52

#323

mtb0minime: minimember; +2,418|6899

DrunkFace wrote:
By general consensus... 2 wins.

Also

2(12)= (2*12) not 2*12

General consensus doesn't mean squat.

Also, why does 2(12) = (2*12) ??? Where does that come from???

2011-04-16 10:48:08

#324

Hurricane2k9: Pendulous Sweaty Balls; +1,538|5946|College Park, MD

unnamednewbie13 wrote:
= what I just said in my last two posts this thread

The amount of silly stuff that general consensus has supported in the past sort of leads me to disregard the results of this poll.

adolf hitler had a lot of general consensus

guess drunkface is a nazi

and so is anyone who says 2

Last edited by Hurricane2k9 (2011-04-16 10:48:17)

2011-04-16 10:49:52

#325

11 Bravo: Banned; +965|5482|Cleveland, Ohio

2

288	43%	43% - 40
2	56%	56% - 51
Total: 91

BF2S Forums 48÷2(9+3) = ??

Poll

unnamednewbie13 wrote:

Hurricane2k9 wrote:

unnamednewbie13 wrote:

Hurricane2k9 wrote:

Jay wrote:

unnamednewbie13 wrote:

Hurricane2k9 wrote:

Jay wrote:

unnamednewbie13 wrote:

Hurricane2k9 wrote:

DrunkFace wrote:

justice wrote:

DrunkFace wrote:

DrunkFace wrote:

unnamednewbie13 wrote:

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