2018 maths 11+ paper

11 Plus Maths – Preparation and Information

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chelmsford dad
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Joined: Sat Oct 10, 2009 4:04 pm

2018 maths 11+ paper

Post by chelmsford dad »

Can someone just clarify something for me on q14d

What is the percentage increase in the cost of buying dollars from June 23rd to June 26th?

June 23rd = $1.40
June 26th = $1.25

The answer is 12% which im assuming is 0.15/1.25

BUT i always thought % increase is difference/original amount

so i would have expected 0.15/1.40 or 10.7% ?

What am i doing wrong please ?
Guest55
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Joined: Mon Feb 12, 2007 2:21 pm

Re: 2018 maths 11+ paper

Post by Guest55 »

chelmsford dad wrote:Can someone just clarify something for me on q14d

What is the percentage increase in the cost of buying dollars from June 23rd to June 26th?

June 23rd = $1.40
June 26th = $1.25

The answer is 12% which im assuming is 0.15/1.25

BUT i always thought % increase is difference/original amount

so i would have expected 0.15/1.40 or 10.7% ?

What am i doing wrong please ?
Is that the whole question? You are correct in the way % increase/decrease is defined - however % increase and decrease is not taught at Primary so the question is not appropriate anyway.
ToadMum
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Location: Essex

Re: 2018 maths 11+ paper

Post by ToadMum »

I have a feeling that this is one of those where Guest55 may pop up to comment on its suitability as an 11+ question. Or at all...

Is that the whole question? Not the second part of one which e.g. asks how much it costs to buy a dollar on each of the dates, first?
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Moderators
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Re: 2018 maths 11+ paper

Post by Moderators »

Please note (again) this section is for 11 plus maths not for the discussion of primary or NC maths.

Please stay on topic.

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ToadMum
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Location: Essex

Re: 2018 maths 11+ paper

Post by ToadMum »

Not wishing to be disrespectful, but one of the points that both G55 and I have made is surely a valid one, at least, that there appears to be part of the question missing?
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx
mitasol
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Joined: Wed Feb 27, 2008 9:59 am

Re: 2018 maths 11+ paper

Post by mitasol »

It is not disrespectful TM you have correctly identified the on topic point from the off topic point. We are always happy to give further guidance if required.
Pl1688
Posts: 53
Joined: Mon Sep 14, 2020 1:35 pm

Re: 2018 maths 11+ paper

Post by Pl1688 »

chelmsford dad wrote: BUT i always thought % increase is difference/original amount

so i would have expected 0.15/1.40 or 10.7% ?

What am i doing wrong please ?
Imagine you wanted to buy $140. On the 23rd, you'd need 100 (probably pounds but could be any currency for purposes of this question). On the 26th, since $ has strengthened, you'd need 112 (140/1.25) which is your 12% increase (100 being your base/original amount). The question is asking for the % increase in cost of buying dollars, not the % change in the exchange rate.

Alternatively, you could ignore this and simply tell your DC that it's an inapppropriate question for 11+
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