Go to navigation
It is currently Sun Dec 04, 2016 4:21 pm

All times are UTC




Post new topic Reply to topic  [ 24 posts ]  Go to page 1, 2, 3  Next
Author Message
 Post subject: Rounding decimals.
PostPosted: Thu Jul 09, 2009 11:22 pm 
Offline

Joined: Tue Jan 01, 2008 1:05 pm
Posts: 515
Tonight's maths question. Can you please round the below number to 2 decimal places. A number of replies would be appreciated.

3.25487

Thanks.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jul 09, 2009 11:24 pm 
Offline

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8113
3.25

ow got something in my eye


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jul 09, 2009 11:29 pm 
Offline

Joined: Tue Jan 01, 2008 1:05 pm
Posts: 515
hermanmunster wrote:
3.25

ow got something in my eye


Thankyou Hermanmunster. I am up against a year 5 top set maths teacher, not to mention a wife, who say you round from the right, and not from the left, and which would give a value of 3.26.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jul 09, 2009 11:30 pm 
Offline

Joined: Sun Feb 08, 2009 11:09 am
Posts: 646
That's what I would have said, but then thought is it a trick question and is the answer 3.26.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jul 09, 2009 11:51 pm 
Offline

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8113
that's the trouble with Herman's method - I don;t round from any direction so the remaining 0.487 is less than half hence the rounded sum would be 3.25.

ho hum.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Jul 09, 2009 11:54 pm 
Offline

Joined: Wed Nov 21, 2007 4:20 pm
Posts: 4660
I would have said 3.26 too.

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jul 10, 2009 6:56 am 
Offline

Joined: Fri Mar 17, 2006 5:12 pm
Posts: 1300
Location: Birmingham
3.26

I was always taught to round from the right iteratively

The Excel ROUND function however thinks it's 3.25 but I think it's wrong.

=ROUND(3.25487,2)

Ken


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jul 10, 2009 7:31 am 
Offline

Joined: Fri Jul 06, 2007 8:31 pm
Posts: 1192
3.25487

Rounded to 2 dp is 3.25

Imagine a number line... 4 is less than 5.. clearly rounds down.

Moving from the right, accumulating 'rounding' is clearly bogus.

_________________
Animis opibusque parati


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jul 10, 2009 7:40 am 
Offline

Joined: Sat Nov 17, 2007 8:55 pm
Posts: 851
Location: Bexley
I would say 3.26 too.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jul 10, 2009 7:43 am 
Offline

Joined: Wed Apr 01, 2009 3:43 pm
Posts: 523
Location: Twells
My year 6 son says 3.25


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 24 posts ]  Go to page 1, 2, 3  Next

All times are UTC


Who is online

Users browsing this forum: No registered users and 3 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