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PostPosted: Thu May 15, 2014 8:38 am 
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Posts: 55
So, here the numbers in each group are related in some way. I'm wondering if this one is a double operation? I still can't see how it's done though!

(17 [21] 25) (15 [24] 33)

( 12 [___] 46)


Whats the answer and how did you find it? :shock:
It was puzzling my daughter this morning and then I couldn't do it :oops:


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PostPosted: Thu May 15, 2014 8:55 am 
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Location: caversham
Add and then halve.

So 12+46= 58 , 58/2=29.


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PostPosted: Thu May 15, 2014 8:56 am 
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(17 [21] 25) (15 [24] 33)

( 12 [___] 46)


17 + 25 = 42 halved is 21

15 + 33 = 48 halved is 24

Answer is 12 + 46 = 58 halved is 29 8)


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PostPosted: Thu May 15, 2014 9:03 am 
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SouthWiltsGrammer wrote:
It was puzzling my daughter this morning and then I couldn't do it :oops:


Suggest buy a How To Do VR book, that's what I did.

Type K get easier with practice you get a feel for the numbers.


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PostPosted: Thu May 15, 2014 9:06 am 
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stevew61 wrote:
SouthWiltsGrammer wrote:
It was puzzling my daughter this morning and then I couldn't do it :oops:


Suggest buy a How To Do VR book, that's what I did.

Type K get easier with practice you get a feel for the numbers.


I had that next to me and I still couldn't do it :oops: maths wasn't isn't my strongest point, I only got a C grade at GCSE. At least I was right in spotting it was a double operation LOL


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PostPosted: Thu May 15, 2014 9:06 am 
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sonasona wrote:
(17 [21] 25) (15 [24] 33)

( 12 [___] 46)


17 + 25 = 42 halved is 21

15 + 33 = 48 halved is 24

Answer is 12 + 46 = 58 halved is 29 8)


Thank you!!!


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PostPosted: Thu May 15, 2014 9:07 am 
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stevew61 wrote:
Add and then halve.

So 12+46= 58 , 58/2=29.



Thank you! I can explain to her tonight now.


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PostPosted: Thu May 15, 2014 1:12 pm 
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Couldn't resist posting the longer way as you won't be surprised to see if some children might do it this way and end up taking more time :( for the same question

(17 [21] 25)

17 + 4 = 21, 21 + 4 = 25 where 4 is calc from (25 - 17)/2

(15 [24] 33)

15 + 9 = 24, 24 + 9 = 33 where 9 is calc from (33 - 15) /2


( 12 [___] 46)

(46 - 12)/2 =17

answer is 12 + 17 = 29


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PostPosted: Thu Jun 26, 2014 11:01 am 
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parent2013 wrote:
Couldn't resist posting the longer way as you won't be surprised to see if some children might do it this way and end up taking more time :( for the same question

(17 [21] 25)

17 + 4 = 21, 21 + 4 = 25 where 4 is calc from (25 - 17)/2

(15 [24] 33)

15 + 9 = 24, 24 + 9 = 33 where 9 is calc from (33 - 15) /2


( 12 [___] 46)

(46 - 12)/2 =17

answer is 12 + 17 = 29



That just boggled my mind! :lol:


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PostPosted: Thu Jun 26, 2014 11:40 am 
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Oh I see what you mean. Quite often there are two different ways of seeing how the middle number can be calculated from the two outer ones - but I'm not sure that on "first solving" it's necessarily going to be clear to the child which is the quicker route. Time pressure is a tough one if creative thought is truly required too.


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