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 Post subject: Simple maths question?
PostPosted: Thu Oct 27, 2011 1:29 pm 
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Joined: Wed Oct 13, 2010 6:48 pm
Posts: 115
Can someone please help me with what appears to be a simple question
1. Work out 56-69+311

Doing 56-69 first as opposed to 69+311 first gives 2 different results.

My thinking is that in the absence of brackets and multiply. I should work from left to right, hence the answer would be 298.

Am I on the right track?

Many thanks


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PostPosted: Thu Oct 27, 2011 1:57 pm 
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Location: Essex
Yes, work from left to right. There are no brackets and the operations ( add and subtract) are of the same status. Same applies to 6 ./. 3x2. The answer is 4 rather than 1.


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PostPosted: Thu Oct 27, 2011 2:51 pm 
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layla22 wrote:
1. Work out 56-69+311

I would think of it as (+56) and (-69) and (+311), then the order would not matter.

(The order does not matter as the two used are plus and minus and they are of the same priority)


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PostPosted: Thu Oct 27, 2011 2:55 pm 
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agreed with 999mum - attach a +or - firmly to the front of the number and then it doesn't matter what order you do them in. eg
-69+56+311 would work too


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PostPosted: Thu Oct 27, 2011 6:38 pm 
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Layla22 how did you get 2 different answers? The answer is 298. The quickest way is to see there is a difference of 13 between the first two numbers and then take this off the third number.


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PostPosted: Thu Oct 27, 2011 7:06 pm 
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Thank you everyone for your prompt replies.
How did I get 2 answers?? Well, ..... I made a fundamental error!!?!! _ I failed to read the minus sign infront of the 69!
I put it down to the stress of this past year and that we have a St Olave's test coming up.
That's my excuse anyway.
Thanks everyone


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PostPosted: Thu Oct 27, 2011 8:25 pm 
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:D That's exactly the sort of thing I would do in an exam!! It's also a bit like in all these threads talking about tutoring, I read torturing.


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