Advice on 11 Plus VR papers and problems
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kili
Posts: 7 Joined: Wed Jul 20, 2011 10:57 am
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by kili » Fri Jul 22, 2011 1:56 pm
could someone please help on this question
1 8 27 64 ?
the answer is 125
mitasol
Posts: 2757 Joined: Wed Feb 27, 2008 9:59 am
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by mitasol » Fri Jul 22, 2011 2:02 pm
These are cubed numbers
1x1x1
2x2x2
3x3x3
rishita
Posts: 21 Joined: Fri May 27, 2011 10:50 am
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by rishita » Fri Jul 22, 2011 3:27 pm
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
yoyo123
Posts: 8099 Joined: Mon Jun 18, 2007 3:32 pm
Location: East Kent
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by yoyo123 » Fri Jul 22, 2011 5:57 pm
it's worth knowing and being able to recognise square numbers, cubed numbers and prime numbers
kili
Posts: 7 Joined: Wed Jul 20, 2011 10:57 am
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by kili » Mon Jul 25, 2011 2:43 pm
Thank you very much!
Yes, i think it is very useful to know prime numbers, cube numbers and square numbers too.
kili
moved
Posts: 3826 Joined: Fri Oct 12, 2007 1:42 pm
Location: Chelmsford and pleased
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by moved » Mon Jul 25, 2011 3:07 pm
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.
Belinda
Posts: 1167 Joined: Thu Nov 08, 2007 10:57 pm
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by Belinda » Mon Jul 25, 2011 10:56 pm
,
Last edited by
Belinda on Thu Nov 01, 2012 12:29 pm, edited 1 time in total.
moved
Posts: 3826 Joined: Fri Oct 12, 2007 1:42 pm
Location: Chelmsford and pleased
Post
by moved » Tue Jul 26, 2011 11:57 am
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.