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 Post subject: percentages
PostPosted: Mon Aug 26, 2013 1:18 pm 
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Joined: Thu Oct 18, 2012 9:41 am
Posts: 434
We are working on percentages at home (DD will be starting year 5 in September)

I am not sure how much detail to cover - for example does DD need to know how to calculate VAT, how to find the percentage increase or decrease if an item is sold above or below cost price?

Also, if given the % profit or loss made, and the selling price, would DD be expected to work out the original price?

I realize this depends on area and school - we are looking at Habs, North London Consortium Girls School and Watford Grammar and HBS.

Thanks
SleepyHead


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 Post subject: Re: percentages
PostPosted: Mon Aug 26, 2013 6:47 pm 
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Joined: Sat Jul 20, 2013 10:31 am
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I would have thought you would need to cover all those scenarios for the schools mentioned


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 Post subject: Re: percentages
PostPosted: Mon Aug 26, 2013 7:36 pm 
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Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3818
Location: Chelmsford and pleased
Usually, at this age, a child should be able to work out a test score or similar as a percentage. Look at some past papers to check.

E.g. Write 15 out of 20 as a percentage/decimal/simplest fraction
or
What is 15% of 360?


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 Post subject: Re: percentages
PostPosted: Mon Aug 26, 2013 7:51 pm 
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Joined: Thu Oct 18, 2012 9:41 am
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hi thanks for replies, :) yes DD can work out a score as a percentage but she's finding the following type of question quite tricky.

question) A shop keeper sells a TV for 60 pounds, and he make a 20% profit, find out the original price of the TV.

similarly ... A TV costs 50 and is sold for 68 pounds, what is the percentage profit a shop keeper makes.

Been struggling with this today... any ideas on how to explain these more complicated percentage questions

thanks
sleepyhead


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 Post subject: Re: percentages
PostPosted: Mon Aug 26, 2013 9:11 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
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I don't thnk original price questions are appropriate for 11+; can you check they are needed?


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 Post subject: Re: percentages
PostPosted: Mon Aug 26, 2013 9:43 pm 
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Joined: Thu Oct 18, 2012 9:41 am
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Thanks guest55 for your reply. I have looked the through some of the north london girls consortium past papers and couldn't find these question types.

Hopefully they are out of scope as Dd found them tricky despite trying to explain as simply As I could.


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 Post subject: Re: percentages
PostPosted: Mon Aug 26, 2013 10:37 pm 
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Joined: Tue Jul 21, 2009 9:56 pm
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If you find they are needed I would suggest doing your example like this.

Selling price is 120% of cost price.

Find 1% by dividing by 120.

Find 100% by multiplying this by 100. You now have cost price.


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 Post subject: Re: percentages
PostPosted: Tue Aug 27, 2013 6:05 am 
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Joined: Thu Oct 18, 2012 9:41 am
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thanks mystery.


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