Go to navigation
It is currently Mon Dec 05, 2016 4:33 am

All times are UTC




Post new topic Reply to topic  [ 11 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Stuck!
PostPosted: Mon Sep 05, 2011 10:01 am 
Offline

Joined: Fri Aug 05, 2011 7:47 am
Posts: 14
Any suggestions?

Question.

48, 24, 72, 18, 90

Answer is 15

Does anybody know what the sequence is?

Flosi


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Mon Sep 05, 2011 10:13 am 
Offline

Joined: Sat Mar 19, 2011 9:46 pm
Posts: 188
It looks to me as alternatively dividing and multiplying by increasing one number each time:

48 / 2 = 24
24 x 3 = 72
72 / 4 = 18
18 x 5 = 90
90 / 6 = 15


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Mon Sep 05, 2011 10:17 am 
Offline

Joined: Mon Feb 14, 2011 1:42 pm
Posts: 987
Location: Birmingham
Hi Flosi

The sequence alternates between multiplication and division, whilst moving up one number each time:

48 /2=24
24 x3=72
72 /4=18
18 x5=90

So: 90 /6=15

It's quite refreshing for me to be answering rather than the one asking question!

Regards, UmSusu

_________________
UmSusu


Last edited by UmSusu on Mon Sep 05, 2011 10:19 am, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Mon Sep 05, 2011 10:18 am 
Offline

Joined: Mon Feb 14, 2011 1:42 pm
Posts: 987
Location: Birmingham
Kiwimum beat me to it! I need to learn to type quicker :oops:

_________________
UmSusu


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Mon Sep 05, 2011 11:07 am 
Offline

Joined: Fri Aug 05, 2011 7:47 am
Posts: 14
Wow

Thanks guys for a quick response.

Wish I could think that quick!

Flosi


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Fri Sep 16, 2011 12:11 pm 
Offline

Joined: Thu May 26, 2011 8:37 pm
Posts: 577
What levels are these qus? Are they 11+ standard? They seem very challenging to me!


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Fri Sep 16, 2011 1:15 pm 
Offline

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2660
Yes they are 11 plus standard.

Patricia


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Fri Sep 16, 2011 6:30 pm 
Offline

Joined: Thu May 26, 2011 8:37 pm
Posts: 577
Thank you, Patricia.

Roughly how long would they be expected to spend on a question like this? That's quite a lot of mental maths trial and error to see which pattern emerges, isn't it?


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Fri Sep 16, 2011 6:48 pm 
Offline

Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2660
With practice, and making notes, these questions should be completed within 30 seconds.

I weekly give daily exercises to include doubling/halving/multiplying/division/adding/subtraction a little every day, 10 sums at the breakfast table will give surprising results over a short period of time.

Divide an A4 sheet into 6 sections in each section place 10 sums, each section containing the same type of problem, all adding, all subtraction, all doubling/halving etc etc. Do not use huge numbers, once the smaller numbers have been mastered the larger numbers become easy.

One section a day is not too much on the work load.

Patricia


Top
 Profile  
 
 Post subject: Re: Stuck!
PostPosted: Fri Sep 16, 2011 6:59 pm 
Offline

Joined: Thu May 26, 2011 8:37 pm
Posts: 577
Patricia, you are brilliant. Thank you so much. Your support is priceless.

When I set these daily sums, do you advise straight multiplying, for example, or a multiple +1, so they get into the habit of looking for the hidden extras?


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ]  Go to page 1, 2  Next

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


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