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 Post subject: Estimating Imperial ConversionsPosted: Mon Sep 03, 2007 8:46 pm

Joined: Fri Jul 06, 2007 8:31 pm
Posts: 1245
From Bond "How to do 11+Maths"

A door is 5 feet 9 inches high. Which is closest to its height in metres? Circle the

1.5 m 1.6 m 1.7 m 1.8 m 1.9 m

We make it 1.8m; the book answer is 1.7m

(a) Are we right? (b) Is this a fair question?

Regards
SVE

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 Post subject: Posted: Mon Sep 03, 2007 9:16 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14008
5ft 9inches is 69 inches

one inch is 2.5cm

69x2.5 = 172.5

so its 172.5cm which is nearer 1.7m

As a secondary maths teacher this seems hard ...

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 Post subject: conversionPosted: Mon Sep 03, 2007 9:31 pm

Joined: Wed May 09, 2007 2:09 pm
Posts: 978
Location: Solihull, West Midlands
However if you use the more accurate conversion rate

1 inch = 2.54 centimetres

then

69 inches is 1.7526 metres , which would (by convention) be rounded UP to 1.8m

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 Post subject: Posted: Tue Sep 04, 2007 6:32 am

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 14008
Usually children are taught to use 1inch = 2.5 cm as the conversion - as I said I think this is not really a 'good' question.

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 Post subject: Posted: Tue Sep 04, 2007 9:20 am

Joined: Fri Jul 06, 2007 8:31 pm
Posts: 1245
Guest55 wrote:
Usually children are taught to use 1inch = 2.5 cm as the conversion

I didn't know that. Is that the conversion factor built into these questions? i.e. a NFER convention?

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 Post subject: Posted: Tue Sep 04, 2007 9:31 am

Joined: Thu Jan 12, 2006 3:29 pm
Posts: 625
Hi SLVE

If the question is a direct conversion question then you would need to use the most accurate approach.

If the question is an estimation then you need to use the easiest approach.

Regards

Mike

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 Post subject: Posted: Tue Sep 04, 2007 12:36 pm

Joined: Fri Jul 06, 2007 8:31 pm
Posts: 1245
Mike wrote:
Hi SLVE

If the question is a direct conversion question then you would need to use the most accurate approach.

If the question is an estimation then you need to use the easiest approach.

Regards

Mike

Mike,

In the question above... which approach would you recommend?

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 Post subject: Posted: Tue Sep 04, 2007 1:00 pm

Joined: Thu Jan 12, 2006 3:29 pm
Posts: 625
Hi

Wouldn´t like to commit myself. This is a Bond question.

If it had been an NFER multiple-choice question it would almost certainly have been an estimate therefore I would use the easier method.

Regards

Mike

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