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 Post subject: DecimalsPosted: Thu Sep 24, 2009 9:15 pm

Joined: Mon Apr 28, 2008 9:57 am
Posts: 223

Sally has a best throw of 11.6m. Her improvement is one-third of her worst throw. What was her worst throw?

Many thanks

Josa

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 Post subject: Posted: Thu Sep 24, 2009 9:20 pm

Joined: Mon Nov 24, 2008 1:25 pm
Posts: 2556
presumably divide that by 4 and times it by 3, ie 3/4 of 11.6 which is, er, 8.7.

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 Post subject: Posted: Thu Sep 24, 2009 9:50 pm

Joined: Mon Apr 28, 2008 9:57 am
Posts: 223
Thank you for your prompt response Milla, but we still don't get how you got the answer

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 Post subject: Posted: Thu Sep 24, 2009 10:15 pm

Joined: Sat Sep 19, 2009 5:06 pm
Posts: 93
Assume x is the worst throw.

Then x + (1/3)x = 11.6

(4/3)x=11.6
x=8.7

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 Post subject: Posted: Fri Sep 25, 2009 12:24 am

Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3818
For children I draw these in boxes. Worst throw is a rectangle cut into three pieces. We know that one of these pieces needs to be added to this rectangle to get the best throw of 11.6. So the longer rectangle is 11.6 long and has 4 even pieces. 11.6 divided by 4 = 2.9.
2.9 can now be written in each box. Worst throw only needed the three original boxes so 2.9 times 3.

Hope this helps, it works with lots of the backwards fraction/percentage questions.

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 Post subject: Posted: Fri Sep 25, 2009 8:03 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
I love a diagram...

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 Post subject: Posted: Fri Sep 25, 2009 8:56 am

Joined: Mon Apr 28, 2008 9:57 am
Posts: 223
Many thanks everyone, Ds got it now and happy.

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