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 Post subject: Stuck on this question
PostPosted: Tue Aug 23, 2011 12:01 am 
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Joined: Wed May 18, 2011 10:56 am
Posts: 215
Hi Patricia or anyone that can help,
My son did a vr paper and I normally go over the mistakes with him, but for this certain question cannot work out how they got to answer, normally ds is good with these has never got them wrong.

1 8 27 64 ?

Answer is 125

Appreciate an answer, sat with this for ages lol.


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PostPosted: Tue Aug 23, 2011 12:38 am 
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Joined: Sat Mar 19, 2011 9:46 pm
Posts: 188
Hi hasmum

Answer is worked out as

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

so
5 x 5 x 5 = 125


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PostPosted: Tue Aug 23, 2011 7:40 am 
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Joined: Mon Jan 30, 2006 4:07 pm
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Its well worth getting your child to recognise these numbers as well as square numbers.

Patricia


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PostPosted: Tue Aug 23, 2011 11:15 am 
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Joined: Wed May 18, 2011 10:56 am
Posts: 215
Hi Patricia,
Thankyou ever so much, I showed my husband this am and he worked it out, before I saw your post, do questions like this actually come up, and also will the children have advanced level codes for the bucks exams. the number q was new to me and my ds.

The difficulty level worries me as at present my ds is getting 75+ out of 80 for ie Walsh, Bright sparks both started in last few weeks. my sons tuition centre gave him Premium series, which I believe are also 21 types seem to be challenging he got 74, 75 77, and 70 for one.

Will the above come up in the bucks exams. ie advanced codes and squaring numbers like the above question.
thanks


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PostPosted: Tue Aug 23, 2011 12:40 pm 
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Joined: Fri Sep 15, 2006 8:51 am
Posts: 8119
I don't know specifically about your area but in most areas it is worth learning to recognise certain series as they can come up in questions:

eg squares... 1 4 9 16 25 36 49 64 81 100 ...

cubes 1 8 27 64...

primes.. 1 2 3 5 7 11 13 17 19 23..

doubling 1 2 4 8 16 32 64 ...


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PostPosted: Tue Aug 23, 2011 1:43 pm 
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Joined: Mon Jan 30, 2006 4:07 pm
Posts: 2660
Quote:
do questions like this actually come up,


Yes

Quote:
and also will the children have advanced level codes for the bucks exams.


Yes, each section of types will always have a few harder questions towards the end of each section.

Quote:
The difficulty level worries me as at present my ds is getting 75+ out of 80 for ie Walsh, Bright sparks both started in last few weeks.


Good Scores!

Quote:
my sons tuition centre gave him Premium series, which I believe are also 21 types seem to be challenging he got 74, 75 77, and 70 for one.


Premium are not totally 21 type friendly, not recommended.

Your son sounds as though he is doing very well with the above scores. Dont start to panic on his behalf. :wink:

Patricia


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PostPosted: Tue Aug 23, 2011 2:45 pm 
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Joined: Wed May 18, 2011 10:56 am
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Thanks kiwimum


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