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 Post subject: Type K - need help on a question please!Posted: Thu May 15, 2014 8:38 am

Joined: Thu Apr 03, 2014 4:47 pm
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?
It was puzzling my daughter this morning and then I couldn't do it

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 Post subject: Re: Type K - need help on a question please!Posted: Thu May 15, 2014 8:55 am

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1776
Location: caversham

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

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 Post subject: Re: Type K - need help on a question please!Posted: Thu May 15, 2014 8:56 am

Joined: Mon Sep 10, 2012 10:51 am
Posts: 868
(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

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 Post subject: Re: Type K - need help on a question please!Posted: Thu May 15, 2014 9:03 am

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1776
Location: caversham
SouthWiltsGrammer wrote:
It was puzzling my daughter this morning and then I couldn't do it

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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 Post subject: Re: Type K - need help on a question please!Posted: Thu May 15, 2014 9:06 am

Joined: Thu Apr 03, 2014 4:47 pm
Posts: 55
stevew61 wrote:
SouthWiltsGrammer wrote:
It was puzzling my daughter this morning and then I couldn't do it

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 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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 Post subject: Re: Type K - need help on a question please!Posted: Thu May 15, 2014 9:06 am

Joined: Thu Apr 03, 2014 4:47 pm
Posts: 55
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

Thank you!!!

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 Post subject: Re: Type K - need help on a question please!Posted: Thu May 15, 2014 9:07 am

Joined: Thu Apr 03, 2014 4:47 pm
Posts: 55
stevew61 wrote:

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

Thank you! I can explain to her tonight now.

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 Post subject: Re: Type K - need help on a question please!Posted: Thu May 15, 2014 1:12 pm

Joined: Mon Aug 12, 2013 9:13 am
Posts: 452
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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 Post subject: Re: Type K - need help on a question please!Posted: Thu Jun 26, 2014 11:01 am

Joined: Thu Apr 03, 2014 4:47 pm
Posts: 55
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!

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 Post subject: Re: Type K - need help on a question please!Posted: Thu Jun 26, 2014 11:40 am

Joined: Tue Jul 21, 2009 9:56 pm
Posts: 8545
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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