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 Post subject: Three groups of numbersPosted: Sat Jul 16, 2011 5:49 pm

Joined: Mon Mar 15, 2010 2:45 pm
Posts: 5432
My DS & I are struggling with the type

X(y)z A(b)c d(?)f

Has anyone posted a logical approach to this that we can follow. I will ask his tutor to go through it with me next week, but in the meantime one of his questions is beating me!

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 5:59 pm

Joined: Sat Feb 13, 2010 11:02 pm
Posts: 420
let us know what the question is then!

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 6:10 pm

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

Have a look here.

viewtopic.php?f=3&t=3740

viewtopic.php?f=3&t=20671

Probably one of the hardest type of question as it involves a good grounding in KS2 maths and a bit of trial and error..........on a personal level I can crack them in the morning but not late in the evening.

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 6:44 pm

Joined: Mon Mar 15, 2010 2:45 pm
Posts: 5432
Thanks - they are the only type he really has trouble with I'm worried he will get bogged down with them. The first one we had trouble with was:

25(50)5 24(40)6 27( )3

I think this one is divide the number on the left by the one on the right and add 10 (took about 10 mins to get that!)

The second one is:

6(15)11 9(16)15 4( )11

I will be embarrassed when someone shows me how easy it is

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 7:04 pm

Joined: Sat Feb 13, 2010 11:02 pm
Posts: 420
scary mum wrote:
25(50)5 24(40)6 27( )3

using the format a(c)b

c=a/b*10 (the left number divided by the right number multiplied by 10)

so I make the answer 90

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 7:12 pm

Joined: Mon Mar 15, 2010 2:45 pm
Posts: 5432
Yes, sorry I got that one, I just didn't put the answer!! I wrote add 10 instead of multiply by- sorry! And the other one?

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 7:35 pm

Joined: Tue Jun 02, 2009 9:28 pm
Posts: 2439
I think the answer is 17.

Ie. a(b)c.

b = (c-a) + 10

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 7:37 pm

Joined: Mon Mar 15, 2010 2:45 pm
Posts: 5432
Thank you. It all looks so simple when you see it.

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 Post subject: Re: Three groups of numbersPosted: Sat Jul 16, 2011 7:44 pm

Joined: Thu Mar 04, 2010 2:51 pm
Posts: 1143
The second one, you take the left number from the right one and add ten. 11-6=5 5 + 10=15.

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