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 Post subject: KS2 Syllabus - Maths
PostPosted: Fri Jul 20, 2012 2:28 pm 
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My dc has come across a question in the Bond Practice Test Maths 11+, which is included in the Bond How to do... Maths book.

Q 50. A door is 5 feet 9 inches high. Which is the closest to its height in meters? Circle the correct answer.
the options are 1.5m 1.6m 1.7m 1.8m 1.9m

Bearing in mind that our dc are taking their respectice tests at the end of Year 5, are they really expected to know the conversion of Imperial to Metric units data?

Tagore


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 Post subject: Re: KS2 Syllabus - Maths
PostPosted: Fri Jul 20, 2012 3:19 pm 
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Tagore wrote:
My dc has come across a question in the Bond Practice Test Maths 11+, which is included in the Bond How to do... Maths book.

Q 50. A door is 5 feet 9 inches high. Which is the closest to its height in meters? Circle the correct answer.
the options are 1.5m 1.6m 1.7m 1.8m 1.9m

Bearing in mind that our dc are taking their respectice tests at the end of Year 5, are they really expected to know the conversion of Imperial to Metric units data?

Tagore


It's in KS2 (cf http://goo.gl/JK5GI)

But that's a shocking question, because the answer hinges on the precision of the conversion factor you use. The correct value is 2.54cm = 1" (because a yard is now defined to be 0.9144m), so 69 x 2.54 = 1.7526m, making the answer 1.8m. But if you use the typical KS2 conversion factor of 2.5cm ~ 1", you get 69 x 2.5 = 1.725m, making the answer 1.7m. 2.5cm ~ 1" is off by nearly 0.5cm per foot, hence the near-3cm difference. It's a pretty fundamental law of setting multiple-choice questions which permit an approximation that the candidate gets credit for providing the correct answer as well.


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 Post subject: Re: KS2 Syllabus - Maths
PostPosted: Fri Jul 20, 2012 3:31 pm 
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Thank you daveg. I agree it is a shocking question but will have to get dc to remeber all the conversion data.
Tagore


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 Post subject: Re: KS2 Syllabus - Maths
PostPosted: Sat Jul 21, 2012 9:57 am 
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Common imperial units and their metric equivalents are in KS2 maths curriculum.

I would have worked it out like this:
Most upper KS2 should know a 30cm ruler is similar to 12" or 1' so:
5 x 30cm = 150cm
9" is 3/4 of a foot; 3/4 of 30cm = 22.5cm
150 + 22.5 = 172.5cm = 1.7m rounded


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 Post subject: Re: KS2 Syllabus - Maths
PostPosted: Sat Jul 21, 2012 4:33 pm 
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wonderwoman wrote:
Common imperial units and their metric equivalents are in KS2 maths curriculum.

I would have worked it out like this:
Most upper KS2 should know a 30cm ruler is similar to 12" or 1' so:
5 x 30cm = 150cm
9" is 3/4 of a foot; 3/4 of 30cm = 22.5cm
150 + 22.5 = 172.5cm = 1.7m rounded


Right. But if they happen to know the correct conversion, they'll get 1.8m. And that's why it's a badly constructed question: the correct answer and the answer that is expected aren't the same.


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 Post subject: Re: KS2 Syllabus - Maths
PostPosted: Sat Jul 21, 2012 5:12 pm 
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Most of the questions I have seen of this type for this age of kids are looking for a reasonable answer

eg a man is 6ft tall is he 1.8cm 180cm 1.8m or 18m tall


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 Post subject: Re: KS2 Syllabus - Maths
PostPosted: Sat Jul 21, 2012 7:04 pm 
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Where does your child do 11plus for this year OP?


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 Post subject: Re: KS2 Syllabus - Maths
PostPosted: Sat Jul 21, 2012 7:45 pm 
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Mystery - I assume the questions asked of me, since I initiated this thread (but I could not make the connection with OP). My dc is going to take her 11+ for NW London and SW Herts schools.
Tagore


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