It is currently Sat Oct 31, 2020 5:50 pm

 All times are UTC

 Page 1 of 1 [ 6 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Calling all maths experts for help with this pleasePosted: Tue Jun 04, 2019 8:55 am

Joined: Wed Jul 12, 2017 3:52 pm
Posts: 103
Please can any one explain how to solve this type of question?

1. Can you find numbers to replace A, B and C in this sum? (A,B and C are different numbers)

A B C
A B C
+ A B C
____________
B B B

2. Can you find a four digit number which is reversed when multiplied by 9? (i.e. ABCD X 9 = DCBA)

_________________
Thank you,

Worrybot

Top

 Posted: Tue Jun 04, 2019 9:47 am

Joined: Mon Dec 24, 2018 3:27 pm
Posts: 45
I think q1 is not correct.

Q2. A has to be 1 otherwise any number time 9 will make 5 digits number. Therefore D is 9. B has to be 0 because any number times with 9 will have carry forward and make 5 digit number. And C is 8. The number is 1089.

Hope that helps.

Top

 Posted: Tue Jun 04, 2019 10:21 am

Joined: Wed Jul 12, 2017 3:52 pm
Posts: 103
Thank you for your help. I have the answer to Q1 and the question is correct. I am trying to understand a way to explain the solution to DS in a simplified way than trying to guess all possible outcomes.

Thank you

_________________
Thank you,

Worrybot

Top

 Posted: Tue Jun 04, 2019 10:34 am

Joined: Thu Nov 27, 2014 4:04 pm
Posts: 1953
With question 1, this is how I did it but I am not a maths teacher and I don't know if there is a better way to teach/explain it.
BBB has to be divisible by 3 as ABC X 3 = BBB.
You can rule out 999, 666 and 333 because they don't give an ABC answer. You can rule out 111 because that wouldn't give a 3 figure answer.
So I started to do 222÷3, 444÷3, 555 ÷3 etc until I got to the number that had the middle number the same as the B.
Hope that makes sense.

Top

 Posted: Tue Jun 04, 2019 10:40 am

Joined: Wed Jul 12, 2017 3:52 pm
Posts: 103
Quote:
Hope that makes sense.

Yes it does make perfect make sense.

Thank you so much

_________________
Thank you,

Worrybot

Top

 Posted: Tue Jun 04, 2019 10:56 am

Joined: Mon Dec 24, 2018 3:27 pm
Posts: 45
worrybot wrote:
Thank you for your help. I have the answer to Q1 and the question is correct. I am trying to understand a way to explain the solution to DS in a simplified way than trying to guess all possible outcomes.

Thank you

Sorry I’m wrong. Tried to do in my head. Loobylow gave perfect answer.

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 6 posts ]

 All times are UTC

#### Who is online

Users browsing this forum: No registered users and 6 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    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