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PostPosted: Sun Sep 23, 2012 6:11 pm 
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Joined: Fri Sep 16, 2011 12:54 pm
Posts: 84
(16(12)3) (49(14)2)
(100(?)3)

The answer is 30, can anyone explain this? Thanks.


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PostPosted: Sun Sep 23, 2012 6:26 pm 
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Bit tricky

Square root the number on the left and then multiply by number on right.

sq root of 16 is 4 X 3 = 12
sq root of 49 is 7 X 2 = 14
sq root of 100 = 10 X 3 = 30


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PostPosted: Sun Sep 23, 2012 6:27 pm 
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Joined: Sat Oct 15, 2011 8:02 am
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12/3 = 4 then this number squared = 16
14/2= 7 again squared =49

Therefore middle number must be 30 as divided by 3= 10 and 10x10 = 100

I think I've explained that ( to myself anyway )


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PostPosted: Sun Sep 23, 2012 6:33 pm 
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Many thanks to you both. I can't believe that there are many 10 year olds that will get that. Certainly not within the allocated time of the test. One of those leave it until the end and have a guess!


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PostPosted: Sun Sep 23, 2012 6:42 pm 
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Joined: Mon Apr 09, 2012 7:56 am
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Dixon wrote:
Many thanks to you both. I can't believe that there are many 10 year olds that will get that. Certainly not within the allocated time of the test. One of those leave it until the end and have a guess!


I've found these ones tricky..Ds sometimes gets the last one wrong in these on the paper..same with the number sequences


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PostPosted: Sun Sep 23, 2012 9:00 pm 
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Possibly the first three numbers 16 49 and 100 will ring a bell as being squares.... hopefully they get the rest fro there


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