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 Post subject: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 12:29 pm

Joined: Wed Oct 17, 2018 11:07 am
Posts: 40
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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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 12:42 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
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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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 1:33 pm

Joined: Tue Jan 22, 2019 1:36 pm
Posts: 23
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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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 2:24 pm

Joined: Wed Oct 17, 2018 11:07 am
Posts: 40
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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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 2:44 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
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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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 2:46 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 3:40 pm

Joined: Wed Jan 18, 2012 12:41 pm
Posts: 11091
Location: Essex
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...?

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 4:21 pm

Joined: Tue Feb 12, 2013 1:38 am
Posts: 190
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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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 5:02 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
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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 Post subject: Re: Help with maths questions from GL paper 9Posted: Fri Oct 09, 2020 9:26 pm

Joined: Mon Sep 14, 2020 1:35 pm
Posts: 52
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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