Go to navigation
It is currently Sun Dec 11, 2016 6:07 am

All times are UTC




Post new topic Reply to topic  [ 7 posts ] 
Author Message
 Post subject: Decimals
PostPosted: Thu Sep 24, 2009 9:15 pm 
Offline

Joined: Mon Apr 28, 2008 9:57 am
Posts: 223
Could someone please help us with this question:

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


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 24, 2009 9:20 pm 
Offline

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.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 24, 2009 9:50 pm 
Offline

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 :oops:


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 24, 2009 10:15 pm 
Offline

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


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 25, 2009 12:24 am 
Offline

Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3818
Location: Chelmsford and pleased
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.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 25, 2009 8:03 am 
Offline

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


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 25, 2009 8:56 am 
Offline

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


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
CALL 020 8204 5060
   
Privacy Policy | Refund Policy | Disclaimer | Copyright © 2004 – 2016