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PostPosted: Mon Sep 03, 2007 8:46 pm 
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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
correct answer.

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?

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SVE

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PostPosted: Mon Sep 03, 2007 9:16 pm 
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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: conversion
PostPosted: Mon Sep 03, 2007 9:31 pm 
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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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PostPosted: Tue Sep 04, 2007 6:32 am 
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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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PostPosted: Tue Sep 04, 2007 9:20 am 
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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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PostPosted: Tue Sep 04, 2007 9:31 am 
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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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PostPosted: Tue Sep 04, 2007 12:36 pm 
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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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PostPosted: Tue Sep 04, 2007 1:00 pm 
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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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