It is currently Thu Dec 08, 2016 7:55 am

 All times are UTC

 Page 1 of 1 [ 9 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Help needed on this sequence question......Posted: Tue Oct 13, 2015 3:57 pm

Joined: Mon Mar 03, 2014 9:10 pm
Posts: 6
Please can anyone help with this vr question?

Give the next number in the following sequence..

1 , 8 , 27 , 64 , ?

The answer given is 125 but I cannot work it out to show my daughter.

Top

 Post subject: Re: Help needed on this sequence question......Posted: Tue Oct 13, 2015 4:00 pm

Joined: Wed Jan 11, 2006 7:10 pm
Posts: 8204
Location: Buckinghamshire
They are cubed numbers;

1 x 1 x 1 = 1
2 x 2 x 2 = 8
3 x 3 x 3 = 27
4 x 4 x 4 = 64
5 x 5 x 5 =125

Top

 Post subject: Re: Help needed on this sequence question......Posted: Tue Oct 13, 2015 4:14 pm

Joined: Wed Jan 18, 2012 11:41 am
Posts: 4600
Location: Essex
[quote="Tink2010"]Please can anyone help with this vr question?

Give the next number in the following sequence..

1 , 8 , 27 , 64 , ?

The answer given is 125 but I cannot work it out to show my daughter.[/quote]

By my reckoning, the next number should be 117:

The difference between 1 and 8 is 7 (4th prime number)
- between 8 and 27 is 19 (8th prime number)
- between 27 and 64 is 37 (12th prime number).

The 16th prime number is 53, I think?

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

Top

 Post subject: Re: Help needed on this sequence question......Posted: Tue Oct 13, 2015 4:16 pm

Joined: Mon Mar 03, 2014 9:10 pm
Posts: 6
Ah thank you so much, she has learnt lots of difference techniques on these sequences but not cubed numbers.

Top

 Post subject: Re: Help needed on this sequence question......Posted: Tue Oct 13, 2015 4:23 pm

Joined: Wed Jan 18, 2012 11:41 am
Posts: 4600
Location: Essex
Sally-Anne wrote:
They are cubed numbers;

1 x 1 x 1 = 1
2 x 2 x 2 = 8
3 x 3 x 3 = 27
4 x 4 x 4 = 64
5 x 5 x 5 =125

Ahh...

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

Top

 Post subject: Re: Help needed on this sequence question......Posted: Tue Oct 13, 2015 7:09 pm

Joined: Sat Jul 24, 2010 9:45 pm
Posts: 1488
Does it ever feel to you as if it were us - parents - doing the 11+?

_________________
It felt like I hit rock bottom; suddenly, there was knocking from beneath... (anon.)

Top

 Post subject: Re: Help needed on this sequence question......Posted: Tue Oct 13, 2015 7:18 pm

Joined: Mon Jul 27, 2015 6:44 am
Posts: 488
Sometimes I look at these questions and it takes me a good while to work them out. Our poor kids have to do them in seconds under pressure. Glad those days are well behind me!

Top

 Post subject: Re: Help needed on this sequence question......Posted: Tue Oct 13, 2015 7:28 pm

Joined: Sat Jul 24, 2010 9:45 pm
Posts: 1488
Same here!

_________________
It felt like I hit rock bottom; suddenly, there was knocking from beneath... (anon.)

Top

 Post subject: Re: Help needed on this sequence question......Posted: Fri Feb 12, 2016 9:46 am

Joined: Fri Feb 12, 2016 9:41 am
Posts: 15
Quote:
By my reckoning, the next number should be 117:

The difference between 1 and 8 is 7 (4th prime number)
- between 8 and 27 is 19 (8th prime number)
- between 27 and 64 is 37 (12th prime number).

The 16th prime number is 53, I think?

I think it will be to hard for little girl to understand^ but the theory is really interesting.

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 9 posts ]

 All times are UTC

#### Who is online

Users browsing this forum: No registered users and 1 guest

 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