Help with maths questions from GL paper 9

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Mumof32018
Posts: 40
Joined: Wed Oct 17, 2018 11:07 am

Help with maths questions from GL paper 9

Post by Mumof32018 »

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!
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Re: Help with maths questions from GL paper 9

Post by Guest55 »

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?
akb
Posts: 23
Joined: Tue Jan 22, 2019 1:36 pm

Re: Help with maths questions from GL paper 9

Post by akb »

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
Mumof32018
Posts: 40
Joined: Wed Oct 17, 2018 11:07 am

Re: Help with maths questions from GL paper 9

Post by Mumof32018 »

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?
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Re: Help with maths questions from GL paper 9

Post by Guest55 »

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
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Re: Help with maths questions from GL paper 9

Post by Guest55 »

https://www.bbc.co.uk/bitesize/guides/z ... revision/6" onclick="window.open(this.href);return false;

might help
ToadMum
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Joined: Wed Jan 18, 2012 12:41 pm
Location: Essex

Re: Help with maths questions from GL paper 9

Post by ToadMum »

Although, given that it's in the GCSE section, it really oughtn't to have to...?
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bridge
Posts: 262
Joined: Tue Feb 12, 2013 1:38 am

Re: Help with maths questions from GL paper 9

Post by bridge »

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.
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Re: Help with maths questions from GL paper 9

Post by Guest55 »

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 ...
Pl1688
Posts: 53
Joined: Mon Sep 14, 2020 1:35 pm

Re: Help with maths questions from GL paper 9

Post by Pl1688 »

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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