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 Post subject: Multiplying decimals
PostPosted: Thu Mar 20, 2008 8:36 pm 
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Joined: Thu Feb 21, 2008 9:48 pm
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Can anyonew advise the best/simplist technique to teach a young child on multiplying decimals e.g. 0.62*0.53


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PostPosted: Thu Mar 20, 2008 9:05 pm 
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Use grid multiplication on 62 x 53 each number is 100 times bigger so the answer will need to be divided by 10000.


0.62 x 0.53


What level is your child working at?


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PostPosted: Fri Mar 21, 2008 9:09 pm 
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Guest 55

Thank you for the response.

Thats the tecnique I had in mind - was wandering whether theres any other easier methods?

My child is KS2 level


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PostPosted: Fri Mar 21, 2008 9:52 pm 
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This is quite high level so I don't think there is an easier way.


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PostPosted: Fri Mar 21, 2008 10:57 pm 
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I don't think they do multiplying decimals in KS2.


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PostPosted: Wed Mar 26, 2008 10:08 am 
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Well I'm not 100% sure whether multiplying decimals is in the KS2 syllabus or not (anyone have a good link through to the definitive KS2 maths syllabus?) but I have seen it in commercially available KS2 revision guides.

But, Katel, if it is definitely not in the KS2 syllabus what is your advice for a parent of a child sitting a selective entry exam which definitely will require some kind of understanding of this?


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PostPosted: Wed Mar 26, 2008 11:24 am 
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Hi

0.62 x 0.53

First, ignore the decimal points.

Giving 62 x 53

Breakdown the sum into two parts

62 x 50 = 3100

62 x 3 = 186

Add the sum of both parts together

3286

Go back to the original sum and count how many numbers there are on the right of the decimal point, there are two numbers for each part of the sum, making four in total.

From the right hand side of 3286 count four places to the left and insert a decimal point giving .3286. I prefer 0.3286.

Regards

Mike

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Mike Edwards is a co-author of The Tutors product range.


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