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PostPosted: Fri Oct 09, 2020 11:29 am 
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Can anyone explain how to work this out:

Mr M measured the length of his garden. It was 20.0m to the nearest tenth of a metre. Between what limits was the actual length?

A. 19.95 to 20.04.
B. 19.9 to 20.1.
C. 19.995 to 20.004.
D. 19.5 to 20.4
E. 19.99 to 20.01.

Also this one:

A bag of apples weighs 2kg to the nearest 100g. Complete this statement: the actual weight of the apples in the bag is between [***] and [***}.

A. 1.995 - 2.005
B. 1.99 - 2.01
C. 1.95 - 2.05
D. 1.9 - 2.1
E. 1.5 - 2.5

TIA!


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PostPosted: Fri Oct 09, 2020 11:42 am 
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All the answers to the first one are wrong!

19.95 to 20.05 is correct

This is not 11 plus material ... it' called upper and lower bounds - the bounds are half the unit above and below; can you do the second one now?


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PostPosted: Fri Oct 09, 2020 12:33 pm 
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Mumof32018 wrote:
Can anyone explain how to work this out:

Mr M measured the length of his garden. It was 20.0m to the nearest tenth of a metre. Between what limits was the actual length?

A. 19.95 to 20.04.
B. 19.9 to 20.1.
C. 19.995 to 20.004.
D. 19.5 to 20.4
E. 19.99 to 20.01.

Also this one:

A bag of apples weighs 2kg to the nearest 100g. Complete this statement: the actual weight of the apples in the bag is between [***] and [***}.

A. 1.995 - 2.005
B. 1.99 - 2.01
C. 1.95 - 2.05
D. 1.9 - 2.1
E. 1.5 - 2.5

TIA!


I think answer to the first one is A.
"It was 20.0m to the nearest tenth of a metre" - means it rounds off to 19.9, 20.0, 20.1 etc..
So 19.95 to 20.04. If the value is 20.05, then it will be rounded to 20.1


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PostPosted: Fri Oct 09, 2020 1:24 pm 
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Thank you very much. Really annoyed with GL. Not the first wrong answer or poorly worded question we've come across.

What do you mean when you say it's not 11+ material? Too hard? My son and I have been in a big tis as he got loads of this paper wrong. having got much higher scores on the previous papers. No wonder!

Is the answer to the second one 1.95-2.05?

Still not clear on showing it to the nearest 100g or, in the earlier case, 10th of a metre? Does that means how many decimals you need to show?


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PostPosted: Fri Oct 09, 2020 1:44 pm 
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akb wrote:

I think answer to the first one is A.
"It was 20.0m to the nearest tenth of a metre" - means it rounds off to 19.9, 20.0, 20.1 etc..
So 19.95 to 20.04. If the value is 20.05, then it will be rounded to 20.1


No - the upper bound is 20.05


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PostPosted: Fri Oct 09, 2020 1:46 pm 
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https://www.bbc.co.uk/bitesize/guides/z ... revision/6

might help


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PostPosted: Fri Oct 09, 2020 2:40 pm 
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Guest55 wrote:
https://www.bbc.co.uk/bitesize/guides/zscq6yc/revision/6

might help


Although, given that it's in the GCSE section, it really oughtn't to have to...?

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PostPosted: Fri Oct 09, 2020 3:21 pm 
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Posts: 111
akb wrote:

I think answer to the first one is A.
"It was 20.0m to the nearest tenth of a metre" - means it rounds off to 19.9, 20.0, 20.1 etc..
So 19.95 to 20.04. If the value is 20.05, then it will be rounded to 20.1


Makes sense to me.


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PostPosted: Fri Oct 09, 2020 4:02 pm 
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bridge wrote:
akb wrote:

I think answer to the first one is A.
"It was 20.0m to the nearest tenth of a metre" - means it rounds off to 19.9, 20.0, 20.1 etc..
So 19.95 to 20.04. If the value is 20.05, then it will be rounded to 20.1


Makes sense to me.


It's wrong and (b) makes no sense if that's what they are doing ...


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PostPosted: Fri Oct 09, 2020 8:26 pm 
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It's likely a printing error that was subsequently corrected.

In the most recent GL paper 9 (question 43), the answers are:

A 19.95 to 20.05
B 19.9 to 20.1
C 19.995 to 20.005
D 19.5 to 20.5
E 19.99 to 20.01

Therefore A is the correct answer. As to whether its an 11+ question or not, there is increasingly an expectation that the DC can work out these questions using a combination of KS2 knowledge (i.e. tenth of a metre = 10cm) and then applying that to the question.


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