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PostPosted: Tue Oct 13, 2015 3:57 pm 
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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.


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PostPosted: Tue Oct 13, 2015 4:00 pm 
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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


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PostPosted: Tue Oct 13, 2015 4:14 pm 
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[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?

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PostPosted: Tue Oct 13, 2015 4:16 pm 
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Ah thank you so much, she has learnt lots of difference techniques on these sequences but not cubed numbers.

Really appreciate your help :D


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PostPosted: Tue Oct 13, 2015 4:23 pm 
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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... :lol:

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PostPosted: Tue Oct 13, 2015 7:09 pm 
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Does it ever feel to you as if it were us - parents - doing the 11+? :lol:

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PostPosted: Tue Oct 13, 2015 7:18 pm 
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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!


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PostPosted: Tue Oct 13, 2015 7:28 pm 
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Same here! :D

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PostPosted: Fri Feb 12, 2016 9:46 am 
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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?


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


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