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 Post subject: What's the answer to this one ?Posted: Fri Aug 16, 2013 3:40 pm

Joined: Thu Aug 15, 2013 1:03 pm
Posts: 59
18 - (9-5) x 3 = ?

To my mind there should be another set of brackets either round the 18 and the ) or the ( and the 3 - otherwise there are two possible answers surely ?

Thoughts ?

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 Post subject: Re: What's the answer to this one ?Posted: Fri Aug 16, 2013 4:17 pm

Joined: Sat Jul 20, 2013 10:31 am
Posts: 168
I think you would need to use the BODMAS operation for this (Brackets,Of,Division,Multiplication,Addition, Subtraction).
It has be be done in that order to get the right answer. Stand to be corrected if I am wrong

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 Post subject: Re: What's the answer to this one ?Posted: Fri Aug 16, 2013 4:20 pm

Joined: Wed Jul 01, 2009 1:04 pm
Posts: 1187
I'd have expected BIDMAS to apply, so brackets, then multiplication and finally subtraction.

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 Post subject: Re: What's the answer to this one ?Posted: Fri Aug 16, 2013 4:36 pm

Joined: Thu Aug 15, 2013 1:03 pm
Posts: 59
Oh ok, so there are rules then ?

Well that does make sense, brackets first is 4, then multiplication making it 12, then subtraction from 18 gives the supposed right answer of 6.

Better make sure my son knows this for the future !

Thanks both

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 Post subject: Re: What's the answer to this one ?Posted: Fri Aug 16, 2013 9:17 pm

Joined: Fri Mar 04, 2011 2:32 pm
Posts: 923
Ask him if he's heard of Bidmas or bodmas, I was scornfully told "Of course mum, I'm not stupid!" Some time ago. But I had never heard of it myself.

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 Post subject: Re: What's the answer to this one ?Posted: Fri Aug 16, 2013 9:20 pm

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8119
I remember being taught "Bless my dear Aunt Sally" ... does that work or should the D be before the M?

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 Post subject: Re: What's the answer to this one ?Posted: Sat Aug 17, 2013 7:35 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
D before M, so

Bless Dear Messy Aunt Sally?

Bless Dad's Miserable Aunt Sally?

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 Post subject: Re: What's the answer to this one ?Posted: Sat Aug 17, 2013 7:11 pm

Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3818
Location: Chelmsford and pleased
D and M can be in either order as can A and S.

BIDMAS

Brackets
Indices (powers)
Division
Multiplication
Subtraction

Or across the Atlantic - PEMDAS
Parentheses
Exponents
Mult
Div
Subtract

I like Bless my dear Aunt Sally!

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 Post subject: Re: What's the answer to this one ?Posted: Sat Aug 17, 2013 7:29 pm

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8119
Oh I am glad that M and D can be either way round!

can stick to the Blessing my dear Aunt Sally.... learnt from an unforgettable maths teacher

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