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 Post subject: help please
PostPosted: Mon Nov 21, 2011 6:18 pm 
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Joined: Tue Feb 22, 2011 11:06 pm
Posts: 75
the latymer school past paper2005

fran bounces 4 times on the trampoline.every bounce is 1 1/2 times as high as the one before.the first bounce was 2 feet high.

how high was the 3rd bounce?the answer 4 1/2 feet

how high was the 4th bounce? the answer6 3/4 feet

can any one explain the work out please.thank you.


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 Post subject: Re: help please
PostPosted: Mon Nov 21, 2011 6:23 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11936
Quote:
Fran bounces 4 times on the trampoline.every bounce is 1 1/2 times as high as the one before.the first bounce was 2 feet high.

how high was the 3rd bounce?

how high was the 4th bounce?
Second bounce is 1.5 times the first = 1.5 x 2 = 3 feet

So third bounce is 1.5 x 3 = 4.5 feet (sorry decimals are easier to type!)

Fourth bounce = 1.5 x 4.5 etc


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 Post subject: Re: help please
PostPosted: Mon Nov 21, 2011 6:28 pm 
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Joined: Wed Feb 27, 2008 8:59 am
Posts: 2001
every bounce is 1.5 times as high as the one before

first bounce is 2ft
second bounce is 1.5 X 2ft = 3ft
third bounce is 1.5 X 3ft = 4.5ft
fourth bounce is 1.5 X 4.5ft = 6.75 or 6 3/4

edit to add - I'm too slow. :)


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 Post subject: Re: help please
PostPosted: Mon Nov 21, 2011 6:34 pm 
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Joined: Tue Feb 22, 2011 11:06 pm
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thankyou very much


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 Post subject: help please
PostPosted: Mon Nov 21, 2011 6:42 pm 
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Joined: Tue Feb 22, 2011 11:06 pm
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the latymer past paper 2005

jane has lots of number 5's and number 4's which she can add together in any way she chooses.circle any numbers below that she cannot make exactly.

11 13 17 18 19

the answer is : 11 is the only one

can anyone explain the work out please.thankyou very much


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 Post subject: Re: help please
PostPosted: Mon Nov 21, 2011 7:09 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11936
Quote:
jane has lots of number 5's and number 4's which she can add together in any way she chooses.circle any numbers below that she cannot make exactly.

11 13 17 18 19



4 times table ....... 4 8 12 16 20 ..... stop when I get beyond 19

add 5 to these 9 13 17 21 ...... ditto

add 10 to them 14 18 22 ...... ditto


Only one I have not made is 11


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 Post subject: Re: help please
PostPosted: Mon Nov 21, 2011 10:48 pm 
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Joined: Tue Feb 22, 2011 11:06 pm
Posts: 75
thankyou.


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