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 Post subject: maths help!Posted: Tue Feb 27, 2007 10:48 am
In Athey maths Paper 2 :
8+6+7-2+9-1= ...
According to my knowledge of maths learned abroad it is 9.
I noticed that in my son's school they seem to ignore the basic maths rules, therefore according to what he would have learned in school the result would be 27.
There cannot be 2 different result of the same simple equasion for goodness sake!

I do not have the answer sheet re the above Athey' test therefore do not know what result is suggested by them . Could someone enlighten me please.

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 Post subject: Posted: Tue Feb 27, 2007 10:54 am
Problem as written, answer is 27.

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 Post subject: Posted: Tue Feb 27, 2007 10:59 am
That is not the right answer since you should do first what is in brackets, then multiplication, divisions, adding and subtracting. And in that order. Any other is not correct.
Anyone agrees with me?

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 Post subject: Posted: Tue Feb 27, 2007 11:02 am

Joined: Fri Mar 17, 2006 5:12 pm
Posts: 1328
Location: Birmingham
Jah,

This type of issue came up last year and we had a long debate about it. The problem is that mathematically you should use BIDMAS to answer the question correctly from a mathermatical point of view - BUT childen are not taught BIDMAS as part of KS1 or KS2. So schools tell children to just work it out from left resulting in an incorrect answer.

I think we concluded that in an formal 11+ exam we would hope that the question would be unambiguous by the inclusion of brackets.

From a mathematical point of view 27 cannot be the answer.

Hope this helps

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 Post subject: Posted: Tue Feb 27, 2007 11:13 am

Joined: Sun Dec 04, 2005 3:47 pm
Posts: 1348
Location: Berks,Bucks
There is no bracket, division or multiplication in you equation.
You can do the additions and subtractions in any order, you will get 27!

Please explain, I don't see how you can possibly get 9...

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 Post subject: Posted: Tue Feb 27, 2007 11:14 am
Thank you! Will have to stick to what they teach in schools, though I think I will not resist temptation and explain to my son that it is not correct way of solving the problem.

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 Post subject: Posted: Tue Feb 27, 2007 11:23 am

Joined: Sun Dec 04, 2005 3:47 pm
Posts: 1348
Location: Berks,Bucks
moose, I think that we posted at the same time. I would really like someone to explain how the result of 9 can be obtained...

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 Post subject: Posted: Tue Feb 27, 2007 11:24 am

Joined: Tue Jan 16, 2007 8:49 am
Posts: 145
Quote:
In Athey maths Paper 2 :
8+6+7-2+9-1= ...

I repeat as well, there is no bracket, division or multiplication in the above sum. The answer 27 is correct as its a simple addition & subtraction which can be done in any order..........
I do not agree with answer 9, unless there is some misprint......

_________________
mum

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 Post subject: Posted: Tue Feb 27, 2007 11:26 am
The answer, if followed step by step , (which it should in this case as there are no brackets), is of course 27.

If the two equations were treated separately then:
8+6+7 ( 21) - 2+9-1 (10)
21- 10 = 11

Sorry, I'm uncertain as to how moose got 9.

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 Post subject: Posted: Tue Feb 27, 2007 11:27 am
Catherine,
You need to add first, so let us put brackets around additions
(8+6+7)-(2+9)-1= 21-11-1=9

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