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 Post subject: help!
PostPosted: Fri Jul 22, 2011 12:56 pm 
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Joined: Wed Jul 20, 2011 9:57 am
Posts: 7
could someone please help on this question

1 8 27 64 ?

the answer is 125


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 Post subject: Re: help!
PostPosted: Fri Jul 22, 2011 1:02 pm 
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Joined: Wed Feb 27, 2008 8:59 am
Posts: 2001
These are cubed numbers
1x1x1
2x2x2
3x3x3


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 Post subject: Re: help!
PostPosted: Fri Jul 22, 2011 2:27 pm 
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Joined: Fri May 27, 2011 9:50 am
Posts: 21
yes, they are cube numbers:

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


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 Post subject: Re: help!
PostPosted: Fri Jul 22, 2011 4:57 pm 
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Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
it's worth knowing and being able to recognise square numbers, cubed numbers and prime numbers


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 Post subject: Re: help!
PostPosted: Mon Jul 25, 2011 1:43 pm 
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Joined: Wed Jul 20, 2011 9:57 am
Posts: 7
Thank you very much!

Yes, i think it is very useful to know prime numbers, cube numbers and square numbers too.

kili


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 Post subject: Re: help!
PostPosted: Mon Jul 25, 2011 2:07 pm 
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Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3818
Location: Chelmsford and pleased
Can I add triangle numbers to that list too. Easy to work out but quicker if you know them.

1 = 1
1 + 2 = 3
1 + 2 +3 = 6
etc.


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 Post subject: Re: help!
PostPosted: Mon Jul 25, 2011 9:56 pm 
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Joined: Thu Nov 08, 2007 9:57 pm
Posts: 1167
,


Last edited by Belinda on Thu Nov 01, 2012 11:29 am, edited 1 time in total.

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 Post subject: Re: help!
PostPosted: Tue Jul 26, 2011 10:57 am 
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Joined: Fri Oct 12, 2007 12:42 pm
Posts: 3818
Location: Chelmsford and pleased
The lovely thing about 13x13 = 169 and 14x14=196 is that the digits used in the answers are the same so children just need to know 13x13 and then swap the last two for 14x14.


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