View Poll Results: 48÷2(9+3) = ???
2
58
58.59%
288
41
41.41%
Voters: 99. You may not vote on this poll
48÷2(9+3) = ???
#92
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If that was a question in maths at school, the mathematical notation indicates that the answer is 2.
Anything associated with brackets needs to be treated separately from anything else i.e. "(9+3)" first, followed by 'its associated' "x 2". Then that finally gets divided into the "48".
Ergo, when x(y+z) is written, you do what's inside the brackets first, followed by the adjacent value outside the brackets. That's the very reason for expressing it like that (instead of 48 ÷ 2 x (9+3))
The notation tells you which parts to treat as an entity - despite the primary school left to right order.
Anything associated with brackets needs to be treated separately from anything else i.e. "(9+3)" first, followed by 'its associated' "x 2". Then that finally gets divided into the "48".
Ergo, when x(y+z) is written, you do what's inside the brackets first, followed by the adjacent value outside the brackets. That's the very reason for expressing it like that (instead of 48 ÷ 2 x (9+3))
The notation tells you which parts to treat as an entity - despite the primary school left to right order.
#93
Can't believe this is still going strong
The answer is clearly 288, just like everything in maths from pythagoras to transposition to calculus, you have to follow the basic rules, BODMAS hasn't been made up for the sake of it, division is done before any multiplication, hence why D is in front of the M (Massive clue there)
2 is not inside the brackets, it has nothing to do with it. It's therefore 48\2x12. (24x12) 288
If you are getting 2 as an answer, you should really rename BODMAS to BOMDAS 59% of scoobynet clearly fluffed their basic GCSE's
Google knows the score..http://www.google.co.uk/search?hl=&q...GB368&ie=UTF-8
288, 288, 288, 288, 288
The answer is clearly 288, just like everything in maths from pythagoras to transposition to calculus, you have to follow the basic rules, BODMAS hasn't been made up for the sake of it, division is done before any multiplication, hence why D is in front of the M (Massive clue there)
2 is not inside the brackets, it has nothing to do with it. It's therefore 48\2x12. (24x12) 288
If you are getting 2 as an answer, you should really rename BODMAS to BOMDAS 59% of scoobynet clearly fluffed their basic GCSE's
Google knows the score..http://www.google.co.uk/search?hl=&q...GB368&ie=UTF-8
288, 288, 288, 288, 288
Last edited by LEO-RS; 09 April 2011 at 05:41 PM.
#98
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Posts: n/a
OK wifes maths genius friend replied back to her:
"bodmas is misleading because actually dividing and multiplying have equal priority so how it's written suggests an answer of 2 but 288 is just as valid without brackets to make it clearer"
She has a 1st degree in Mathematics, has a Masters in Mathematics and is currently studying for her doctorate in Mathematics and so i'll take her word for it
"bodmas is misleading because actually dividing and multiplying have equal priority so how it's written suggests an answer of 2 but 288 is just as valid without brackets to make it clearer"
She has a 1st degree in Mathematics, has a Masters in Mathematics and is currently studying for her doctorate in Mathematics and so i'll take her word for it
#99
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OK wifes maths genius friend replied back to her:
"bodmas is misleading because actually dividing and multiplying have equal priority so how it's written suggests an answer of 2 but 288 is just as valid without brackets to make it clearer"
She has a 1st degree in Mathematics, has a Masters in Mathematics and is currently studying for her doctorate in Mathematics and so i'll take her word for it
"bodmas is misleading because actually dividing and multiplying have equal priority so how it's written suggests an answer of 2 but 288 is just as valid without brackets to make it clearer"
She has a 1st degree in Mathematics, has a Masters in Mathematics and is currently studying for her doctorate in Mathematics and so i'll take her word for it
#100
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That's exactly what I implied about three pages ago. The sum is intentionally written out ambiguously.
It ought to be in two sets of brackets. it's ambiguous as to where the multiplying 2 belongs in the problem. It's made more ambiguous by pressing the 2 up close to the bracket - it's implying it has a closer relationship to the sum within the bracket than it does with the numbers outside it, which is wrong.
If the bracket had a power attached to it, I would agree that it pertained to the bracket, but a mere multiplier is ambiguous and regardless of how close it's placed to the sum in parenthesis, it is ACTUALLY part of the preceding sum.
#105
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A* @ GCSE, A @ A'Level, and plenty of pure maths in my degree too
The answer's still 2
edit/ boomer's post (#68 in thread) is spot on.
Last edited by Steve_PPP; 09 April 2011 at 11:55 PM.
#106
Moderator
iTrader: (1)
Going by this thread, it's 2 or 288, depending upon how you read the silly numbers and brackets.
If there is this much arguement over the question as it was written, then I am potentially right either way, so I'll happily hedge my bets and answer either/or.
BTW, I hate maths but fwiw, I came up with 288.
If there is this much arguement over the question as it was written, then I am potentially right either way, so I'll happily hedge my bets and answer either/or.
BTW, I hate maths but fwiw, I came up with 288.
#107
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Thing is it would never be shown like that as a maths question, anyway.
It would either be:
48
-------
2(9+3)
or
48
-- x (9+3)
2
1st gives 2; 2nd one gives 288.
The ÷ sign isn't normally used in pure mathematical notation, so therefore no ambiguity as which 'order' to worry about.
But if using the ÷ sign, then the only way of writng it, so no confusion, would be:-
(48÷2)(9+3) = 288
or
48÷(2(9+3)) = 2
It would either be:
48
-------
2(9+3)
or
48
-- x (9+3)
2
1st gives 2; 2nd one gives 288.
The ÷ sign isn't normally used in pure mathematical notation, so therefore no ambiguity as which 'order' to worry about.
But if using the ÷ sign, then the only way of writng it, so no confusion, would be:-
(48÷2)(9+3) = 288
or
48÷(2(9+3)) = 2
#109
If there's no priority in division and multiplication, isn't it simply 48 / 2 * 12. Left to right it works as 24*12?
I personally think the Math is written poorly - if you want priority, you have to use brackets.
I personally think the Math is written poorly - if you want priority, you have to use brackets.
#110
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I think until we get to the root of the equation, divisions between sub-sets within the forum will simply increase exponentially
Some of the arguments being put forth are rational but many irrational and the odd one is completely imaginary
I think we should integrate the ideas before we fail to differentiate between these positions.
(maths geek humour FTW!)
Some of the arguments being put forth are rational but many irrational and the odd one is completely imaginary
I think we should integrate the ideas before we fail to differentiate between these positions.
(maths geek humour FTW!)
#111
The division sign separates the two sides such that the bracketed item has to be calculated before the division is done. The only way to change that is as above where two sets of brackets are used.
Les
Les
#112
I think the notation is ambiguious. However I never liked maths at school, but was assured on many occasions that these things stem out of real life situations.
I'd probably start at the original situation and then I'd know whether the person is asking for 48 divided by 24 or 24 multiplied by 12.
I'd probably start at the original situation and then I'd know whether the person is asking for 48 divided by 24 or 24 multiplied by 12.
#113
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This makes a lot of sense, as by the divide ÷ sign's very meaning, the top dot denotes all the stuff that would be to the left hand side of the dash i.e. the top numerator. And the bottom dot denotes the stuff on the right hand side of the dash i.e. the bottom denominator.
Last edited by joz8968; 11 April 2011 at 03:38 PM.
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