It is currently Sat Dec 03, 2016 2:25 am

 All times are UTC

 Page 1 of 1 [ 5 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Maths QuestionPosted: Wed Oct 31, 2007 2:00 pm
Hello everyone.
Please what is the quickest and easiest way of working this question out?

The local bookshop has a sale. Every item in the shop is reduced by 25%.
Melanie bought a picture for Â£1.50
What was the price of the picture book BEFORE the sale started?

Top

 Post subject: Posted: Wed Oct 31, 2007 2:31 pm
if the picture cost Â£1.50 and has been reduced by 25% then that means that Â£1.50 is 75% of the original price.

75% is 3/4 so divide Â£1.50 into 3 = 50p. 50p then is 25%.

Add on 25% (50p) making original cost Â£2.00.

Top

 Post subject: Posted: Wed Oct 31, 2007 2:50 pm

Joined: Wed Jul 11, 2007 9:53 pm
Posts: 41
I taught dd one way to do nearly all these kind of percentage and fraction questions as she was getting confused-

part percentage
------ x -------------
whole 100

put in the numbers you have, then multiply by the diagonal number and divide by the other number.

1.50( part of the whole number) 75( you know 1.50 is 75% of the whole)
----- x ----
? 100

1.50x100 / 75 = 2.00
I hope I've put that in right, gotta dash up to school now.

Top

 Post subject: Posted: Sun Nov 11, 2007 6:50 pm
If you are asked to find an original price, put 100 over the percentage you have (75, in the above example), cancel this improper fraction down to its lowest terms, and multiply the resulting 'constant fraction' by any discounted price, cross-cancelling if possible, to find the original cost.

Taking the above example:

100/75 x 150/1 = 4/3 x 150/1 = 4/1 x 50/1 = 200 = Â£2 (This obviously would benefit from standard fraction formatting!)

If you have the original price and need to find out what the discounted price would be, you just need to invert the 'constant fraction'.

E.g. 3/4 x 200/1 = 3/1 x 50/1 = 150 = Â£1.50

Top

 Post subject: Posted: Sun Nov 11, 2007 7:36 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11931
Cross -cancelling is a very dodgy idea to teach someone as it only works if you have one fraction equal to another - again it's something a maths teacher would tend to avoid because of problems later on with harder fractional equations.

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 5 posts ]

 All times are UTC

#### Who is online

Users browsing this forum: No registered users and 2 guests

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

Search for:
 Jump to:  Select a forum ------------------ FORUM RULES    Forum Rules and FAQs 11 PLUS SUBJECTS    VERBAL REASONING    MATHS    ENGLISH    NON-VERBAL REASONING    CEM 11 Plus GENERAL    GENERAL 11 PLUS TOPICS    11 PLUS APPEALS    11 PLUS TUTORS    INDEPENDENT SCHOOLS    11 PLUS CDs/SOFTWARE    11 PLUS TIPS    PRIMARY    SEN and the 11 PLUS    EVERYTHING ELSE .... 11 PLUS REGIONS    Berkshire    Bexley and Bromley    Birmingham, Walsall, Wolverhampton and Wrekin    Buckinghamshire    Devon    Dorset    Essex    Essex - Redbridge    Gloucestershire    Hertfordshire (South West)    Hertfordshire (Other and North London)    Kent    Lancashire & Cumbria    Lincolnshire    Medway    Northern Ireland    Surrey (Sutton, Kingston and Wandsworth)    Trafford    Warwickshire    Wiltshire    Wirral    Yorkshire BEYOND 11 PLUS    Beyond 11 Plus - General    GCSEs    6th Form    University